CollapsiblePanelExtender Doesn't Work With UserControl?
Mar 2, 2010
Iam trying to use a UserControl named CheckBoxControl as value for the ExpandControlID/CollapseControlID attributes of the CollapsiblePanelExtender. It works fine when I use a normal CheckBox instead.
<uc:CheckBoxControl ID="ucHaftpflicht" runat="server" OnCheckedChanged="UpdateStatus" ControlLabel="Haftpflicht" />
<asp:Panel ID="HaftpflichtPanel" runat="server">
</asp:Panel>
<asp:CollapsiblePanelExtender ID="CollapsiblePanelExtender" runat="server" CollapseControlID="ucHaftpflicht.CheckBox" ExpandControlID="ucHaftpflicht.CheckBox" TargetControlID="HaftpflichtPanel" />
When I run the site, most ajax controls on my site disappear and I get following errors in firefox script error console:
Fehler: Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method.
Fehler: Sys.ArgumentException: Failed to find element "ucHaftpflicht.CheckBox"
Parameter name: CollapseControlID
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