Applying found solution to collapsible nested GridView, I've run into a problem with certain DIV height issue.
Namely, when nested GridView is not shown, DIV has a certain height which is not desirable, as shown in the pic bellow:
When nested GridView is shown, DIV is showing nested GridView correctly, as shown in the pic bellow:
Here's the aspx.cs:
<asp:GridView ID="GridViewGroup" runat="server" Height="50px"
AutoGenerateColumns="False"
AllowSorting="true"
ShowFooter="true"
DataKeyNames="GroupID"
SelectMethod="GridViewGroup_GetData"
OnRowDataBound="GridViewGroup_RowDataBound" Width="711px"
>
...
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