Hi, i have issue about gridPanel in resize window.

See my code and images to understand

<ext:Window ID="Window1" runat="server" Title="Título" Width="900" Height="500" AutoShow="false"
    Modal="true" Layout="Fit" Maximizable="true" Closable="true" Hidden="true" AutoScroll="true"
    MonitorResize="true">
    <Items>
        <ext:Panel ID="Panel2" runat="server" Padding="5" Height="500" LabelAlign="Top" Width="900"
            Layout="Fit">
            <Items>
                <ext:BorderLayout ID="BorderLayout3" runat="server">
                    <West Split="true" CollapseMode="Mini">
                        <ext:Panel ID="Panel3" runat="server" Width="320">
                            <Content>
                                <ext:Panel ID="Panel8" runat="server" Height="320" LabelWidth="0" Border="false"
                                    Title="DADOS DO CONTRIBUINTE" Icon="UserMagnify" Padding="10">
                                    <Items>
                                        <ext:Label ID="Label9" runat="server" Html="<b>IE</b><br/>" />
                                        <ext:Label ID="Label11" runat="server" Text="." />
                                        <ext:Label ID="Label13" runat="server" Html="<br/><br/><b>CNPJ/CPF</b><br/>" />
                                        <ext:Label ID="Label14" runat="server" Text="." />
                                        <ext:Label ID="Label15" runat="server" Html="<br/><br/><b>Razão Social</b><br/>" />
                                        <ext:Label ID="Label16" runat="server" Text="." />
                                        <ext:Label ID="Label17" runat="server" Html="<br/><br/><b>Endereço</b><br/>" />
                                        <ext:Label ID="Label18" runat="server" Text="." />
                                        <ext:Label ID="Label19" runat="server" Html="<br/><br/><b>Telefone</b><br/>" />
                                        <ext:Label ID="Label20" runat="server" Text="." />
                                        <ext:Label ID="Label21" runat="server" Html="<br/><br/><br/><b>Status</b><br/>" />
                                        <ext:Label ID="Label22" runat="server" Text="." />
                                        <ext:Panel ID="Panel9" runat="server" Width="330" Height="32" Border="false" StyleSpec='margin-top:5px; margin-right:5px;'>
                                            <Content>
                                                <ext:LinkButton ID="LinkButton1" runat="server" Text="Cadastro">
                                                    <Listeners>
                                                        <Click Handler="window.open('../../ExtratoFAC_V2.aspx?ruc='+ #{txtIE}.getValue() +'&secao=1,2,6', 'BrowserWindow_1495440923', 'menubar=0,toolbar=0,status=0,scrollbars=1,location=0,resizable=1,top=40,left=40,height=600,width=822');" />
                                                    </Listeners>
                                                </ext:LinkButton>
                                                |
                                                <ext:LinkButton ID="LinkButton2" runat="server" Text="Conta Corrente">
                                                    <Listeners>
                                                        <Click Handler="window.open('../../tax.net.ctacte/vit_consultaperiodosctacte.aspx?RUC='+ #{txtIE}.getValue() , 'BrowserWindow_1495440923', 'menubar=0,toolbar=0,status=0,scrollbars=1,location=0,resizable=1,top=40,left=40,height=600,width=822');" />
                                                    </Listeners>
                                                </ext:LinkButton>
                                                |
                                                <ext:LinkButton ID="LinkButton3" runat="server" Text="Processos">
                                                    <Listeners>
                                                        <Click Handler="window.open('../../tax.Net.GestaoFluxoTrabalho/GFT_EstadoProceso.aspx?apli=FIS&IE='+ #{txtIE}.getValue() , 'BrowserWindow_1495440923', 'menubar=0,toolbar=0,status=0,scrollbars=1,location=0,resizable=1,top=40,left=40,height=600,width=822');" />
                                                    </Listeners>
                                                </ext:LinkButton>
                                                |
                                                <ext:LinkButton ID="LinkButton4" runat="server" Text="TTD">
                                                    <Listeners>
                                                        <Click Handler="window.open('../../tax.net.ttd/consulta/CompletaConcessao.aspx?ie='+ #{txtIE}.getValue() +'&sit=1', 'BrowserWindow_1495440923', 'menubar=0,toolbar=0,status=0,scrollbars=1,location=0,resizable=1,top=40,left=40,height=600,width=822');" />
                                                    </Listeners>
                                                </ext:LinkButton>
                                            </Content>
                                        </ext:Panel>
                                    </Items>
                                </ext:Panel>
                                <ext:Panel ID="Panel10" runat="server" Border="false" Title="DOCUMENTOS DE FISCALIZAÇÃO"
                                    Icon="PageWhiteStack" Padding="10">
                                    <Content>
                                        <ext:CompositeField ID="CompositeField6" runat="server" Height="20">
                                            <Items>
                                                <ext:LinkButton ID="LinkButton5" runat="server" Text="Termo de Início de Fiscalização">
                                                    <DirectEvents>
                                                        <Click ViewStateMode="Enabled" OnEvent="lnkTermoInicioFisc_Click">
                                                            <EventMask ShowMask="true" />
                                                        </Click>
                                                    </DirectEvents>
                                                </ext:LinkButton>
                                            </Items>
                                        </ext:CompositeField>
                                        <ext:CompositeField ID="CompositeField7" runat="server" Height="20" Cls="labelTexto">
                                            <Items>
                                                <ext:LinkButton ID="LinkButton6" runat="server" Text="Infração Fiscal">
                                                    <DirectEvents>
                                                        <Click ViewStateMode="Enabled" OnEvent="lnkInfracaoFiscal_Click">
                                                            <EventMask ShowMask="true" />
                                                        </Click>
                                                    </DirectEvents>
                                                </ext:LinkButton>
                                            </Items>
                                        </ext:CompositeField>
                                        <ext:CompositeField ID="CompositeField11" runat="server" Height="20" Cls="labelTexto">
                                            <Items>
                                                <ext:LinkButton ID="LinkButton7" runat="server" Text="Termo de Intimação p/ Def. Prévia">
                                                    <DirectEvents>
                                                        <Click ViewStateMode="Enabled" OnEvent="lnkTermoIntimacaoDefPrevia_Click">
                                                            <EventMask ShowMask="true" />
                                                        </Click>
                                                    </DirectEvents>
                                                </ext:LinkButton>
                                            </Items>
                                        </ext:CompositeField>
                                        <ext:CompositeField ID="CompositeField12" runat="server" Height="20" Cls="labelTexto">
                                            <Items>
                                                <ext:LinkButton ID="LinkButton8" Disabled="true" runat="server" Text="Notificação Fiscal">
                                                    <DirectEvents>
                                                        <Click ViewStateMode="Enabled" OnEvent="lnkNotifFiscal_Click">
                                                            <EventMask ShowMask="true" />
                                                        </Click>
                                                    </DirectEvents>
                                                </ext:LinkButton>
                                            </Items>
                                        </ext:CompositeField>
                                        <ext:CompositeField ID="CompositeField13" runat="server" Height="20" Cls="labelTexto">
                                            <Items>
                                                <ext:LinkButton ID="LinkButton9" Disabled="true" runat="server" Text="Termo de Encerramento">
                                                    <DirectEvents>
                                                        <Click ViewStateMode="Enabled" OnEvent="lnkTermoEncerramento_Click">
                                                            <EventMask ShowMask="true" />
                                                        </Click>
                                                    </DirectEvents>
                                                </ext:LinkButton>
                                            </Items>
                                        </ext:CompositeField>
                                    </Content>
                                </ext:Panel>
                            </Content>
                        </ext:Panel>
                    </West>
                    <Center>
                        <ext:Panel ID="Panel12" runat="server" Border="true" Padding="10" AutoScroll="true"
                            MonitorResize="true">
                            <Items>
                                <ext:Panel ID="Panel13" runat="server" Border="false" LabelAlign="Right" AutoWidth="true"
                                    Cls="topBar_Panels">
                                    <TopBar>
                                        <ext:Toolbar ID="Toolbar7" HideBorders="true" AutoWidth="true" Cls="topBar_Panels"
                                            runat="server" StyleSpec="margin-bottom: 5px; margin-right: 10px;">
                                            <Items>
                                                <ext:Button ID="Button3" runat="server" Text="Anterior" Icon="ArrowLeft" StandOut="true"
                                                    StyleSpec="margin-right: 10px;">
                                                    <DirectEvents>
                                                        <Click OnEvent="btnAnterior_Click" ViewStateMode="Enabled">
                                                            <EventMask ShowMask="true" />
                                                        </Click>
                                                    </DirectEvents>
                                                </ext:Button>
                                                <ext:Button ID="Button7" runat="server" Text="Próximo" Icon="ArrowRight" StandOut="true"
                                                    IconAlign="Right">
                                                    <DirectEvents>
                                                        <Click OnEvent="btnProximo_Click" ViewStateMode="Enabled">
                                                            <EventMask ShowMask="true" />
                                                        </Click>
                                                    </DirectEvents>
                                                </ext:Button>
                                            </Items>
                                        </ext:Toolbar>
                                    </TopBar>
                                    <Items>
                                    </Items>
                                    <BottomBar>
                                        <ext:Toolbar ID="Toolbar8" runat="server" AutoWidth="true" Cls="topBar_Panels" StyleSpec="border-top-color: white;">
                                            <Items>
                                                <ext:Button runat="server" ID="Button8" Text="Registrar gestão" Icon="DoorIn" AutoWidth="True"
                                                    StandOut="true" StyleSpec="margin-right: 10px;">
                                                </ext:Button>
                                                <ext:Button runat="server" ID="Button9" Text="Aceitar defesa prévia" Icon="ThumbUp"
                                                    AutoWidth="True" StandOut="true" StyleSpec="margin-right: 10px;">
                                                </ext:Button>
                                                <ext:Button runat="server" ID="Button10" Text="Denegar defesa prévia" Icon="ThumbDown"
                                                    AutoWidth="True" StandOut="true">
                                                </ext:Button>
                                            </Items>
                                        </ext:Toolbar>
                                    </BottomBar>
                                </ext:Panel>
                                <ext:GridPanel runat="server" ID="GridPanel1" AutoScroll="true" Height="135" AutoExpandColumn="Assunto"
                                    Collapsible="true" StyleSpec='margin:10px auto;' Title="Avisos">
                                    <Store>
                                        <ext:Store ID="store1" runat="server">
                                            <Reader>
                                                <ext:JsonReader>
                                                    <Fields>
                                                        <ext:RecordField Name="DataEnvio" />
                                                        <ext:RecordField Name="DescricaoTipo" />
                                                        <ext:RecordField Name="Assunto" />
                                                        <ext:RecordField Name="DescricaoStatusPagamento" />
                                                        <ext:RecordField Name="DescricaoStatusLido" />
                                                    </Fields>
                                                </ext:JsonReader>
                                            </Reader>
                                        </ext:Store>
                                    </Store>
                                    <ColumnModel>
                                        <Columns>
                                            <ext:Column Header="Data" Width="130" DataIndex="DataEnvio" />
                                            <ext:Column Header="Tipo" Width="150" DataIndex="DescricaoTipo" />
                                            <ext:Column Header="Assunto" Width="80" DataIndex="Assunto" />
                                            <ext:ImageCommandColumn Header="Lido" Align="Center" Width="40" Css="CentralizaLink"
                                                DataIndex="DescricaoStatusLido">
                                                <Commands>
                                                    <ext:ImageCommand Icon="Tick" CommandName="StatusLido" />
                                                </Commands>
                                                <PrepareCommand Fn="prepareCommand" />
                                            </ext:ImageCommandColumn>
                                        </Columns>
                                    </ColumnModel>
                                    <SelectionModel>
                                        <ext:RowSelectionModel ID="RowSelectionModel2" runat="server" />
                                    </SelectionModel>
                                </ext:GridPanel>
                            </Items>
                        </ext:Panel>
                    </Center>
                </ext:BorderLayout>
            </Items>
        </ext:Panel>
    </Items>
</ext:Window>
Before resize:

Click image for larger version. 

Name:	antes.jpg 
Views:	144 
Size:	48.6 KB 
ID:	2994

After resize:

Click image for larger version. 

Name:	depois.jpg 
Views:	149 
Size:	55.0 KB 
ID:	2995