I have a gridpanel and I want to bring the id of the row that the user selects so as to load another grid panel dependent on the first one, associative gridpanel. thank you

<ext:Panel
        runat="server"
        Width="500"
        Height="300"
        ReferenceHolder="true"
        Layout="HBoxLayout"
        AutoDataBind="true">
        <Items>
            <ext:GridPanel
                runat="server"
                ID="Clientes"
                Title="CLIENTES"
                BindString="{Clientes}"
                Reference="clienteGrid"
                Flex="1">
                <Store>
                    <ext:Store runat="server" ID="Store1">
                        <Model>
                            <ext:Model runat="server" Name="Customer" ID="hola">
                                <Fields>
                                    <ext:ModelField Name="ID" />
                                    <ext:ModelField Name="DESCRIPCION" />
                                </Fields>
                            </ext:Model>
                        </Model>
                    </ext:Store>
                </Store>
                <ColumnModel>
                    <Columns>
                        <ext:Column
                            runat="server"
                            Text="Nombre"
                            DataIndex="ID" />
                        <ext:Column
                            runat="server"
                            Text="Telefono"
                            DataIndex="DESCRIPCION"
                            Flex="1" />
                    </Columns>
                </ColumnModel>
            </ext:GridPanel>