[CLOSED] Grid editing doesn't work inside FieldSet

[sisa]

Hi,

I have a editable GridPanel inside a FieldSet. It is very simple, the editable column has an editor of type TextField.
The problem is that the editing doesn't work. Even if I double-click, nothing happens, as the editor were not in the grid.
If I remove the FieldSet (so I put the grid outside the fieldset), the editor works perfectly and displays properly the tetxtbox
on double click.

Can you tell me why I have this strange behaviour? Is this a known problem?
Below you find the piece of markup with fieldset and gridpanel; it's very simple.

Thank you

                 
                <ext:FieldSet ID="ContainerFieldSet" runat="server" Title="Container" Collapsible="true" Collapsed="True">
              <Items>
                <ext:Checkbox runat="server" ID="chkIsContainer" Handler="checkIsContainer" FieldLabel="Checkbox" />
                <ext:GridPanel runat="server" ID="gridContainer" AutoScroll="true" Height="100px">
                  <Store>
                    <ext:Store ID="storeContainer" runat="server">
                      <Model>
                        <ext:Model ID="modelContainer" runat="server">
                          <Fields>
                            <ext:ModelField Name="Id" />
                            <ext:ModelField Name="ContainerNumber" />
                          </Fields>
                        </ext:Model>
                      </Model>
                    </ext:Store>
                  </Store>
                  <ColumnModel runat="server">
                    <Columns>
                      <ext:Column ID="colContainerId" runat="server" DataIndex="Id" Hidden="true" Text="Id" />
                      <ext:Column ID="colContainerNumber" runat="server" DataIndex="ContainerNumber" Flex="1" Text="Number">
                          <Editor>
                             <ext:TextField ID="test" runat="server"></ext:TextField>
                            </Editor>
                      </ext:Column>
                    </Columns>
                  </ColumnModel>
                    <Plugins>
                         <ext:CellEditing ID="CellEditing1" runat="server">
                          </ext:CellEditing>
                     </Plugins>
                </ext:GridPanel>
               </Items>
            </ext:FieldSet>