<div class="tab-pane" id="create" style="height: 700px;" runat="server">
<asp:UpdatePanel ID="upCreate" runat="server">
<ContentTemplate>
<asp:DropDownList ID="ddlTemplate" runat="server" OnSelectedIndexChanged="ddlTemplate_SelectedIndexChanged" AutoPostBack="true" Width="150px" />
<asp:TextBox ID="tbEditor" runat="server" TextMode="MultiLine" Height="400" Width="600"></asp:TextBox>
<asp:HtmlEditorExtender DisplaySourceTab="true" id="editorNote" TargetControlID="tbEditor" runat="server">
</asp:HtmlEditorExtender>
</ContentTemplate>
</asp:UpdatePanel>
So with the above code, I have a few tabs that uses bootstrap. When this control is used on regular page and it's not within a tab control, it displays fine. With the control in the above tab pane, the Editor only displays when postback occurs when dropdownlist item is changes...otherwise, when I click on the tab, the other controls show but the editor shows only a thin gray vertical line (which when hovered over tiny spaces, it displays the toolbox control.....). So If I add the ToolBox item to only have one item, the gray vertical bar is tiny only probably holding space for that one control So how do I ensure the control loads initially without doing a postback? This tab panes is actually in a modal pop up....I have other modal pop up as well but that one doesn't have tabs so it works fine so it's not the modal pop up that is the issue but the tabs.