Posted 10 September 2017, 11:43 am ESTI'm attempting to add C1FormDecorators to a page uses the C1Tabs control. The first tab contains options to customize a report, including buttons, dropdownlists, a C1TreeView, textboxes, etc. The second tab contains a C1Grid that displays the results of the query.
I've discovered that this line:
<wijmo:C1ButtonExtender ID="extbtnMissing" runat="server" TargetControlID="btnMissing" />
works fine, so long as btnMissing is not on a C1Tab page. Whenever it is on a page, I get a System.InvalidOperationException: TargetControlID is invalid.
The C1DropDownExtender exhibits the same problem.