Programmatically adding a ConfirmButtonExtender

Hi,

I cannot get my ConfirmButtonExtender to work when I add it from the code behind.

A javascript page error occurs the page loads:

Line: 2829
Char:23
Error: Sys.ArgumentException: Value must not be null for Controls and Behaviors.
Parameter name: element
Code:0

---------------

Here is the code:

-- .asp snippet----

 <asp:ScriptManager ID="ScriptMan1" runat="server"> </asp:ScriptManager> <asp:Panel ID="Panel1" runat="server"> </asp:Panel> 

---.asp.cs snippet----

protected void Page_Load(object sender, EventArgs e) { Button button =new Button(); button.Text ="Click Me"; Panel1.Controls.Add(button); AjaxControlToolkit.ConfirmButtonExtender confirmDeleteExt =new AjaxControlToolkit.ConfirmButtonExtender(); confirmDeleteExt.TargetControlID = button.UniqueID; confirmDeleteExt.ConfirmText ="Are you sure?"; Panel1.Controls.Add(confirmDeleteExt); }

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It's nothing special, but what am I missing?!

I am dynamically building the page, so beginning with the button on the page is not an option (which works no problem).

Thanks!

Your code works fine on my computer.

OK,

Thanks for your reply, kipo, looking at it again it seems that the error only seems to occur when using a masterpage.

Does it still work for you if you put all of it into a masterpage?

I've tried to put your code in page which is using MasterPage and it doesn't work, so you were right - error is occuring only with MasterPage. But, you can achieve it with this code:

Button button = new Button();
button.Text = "Click Me";
button.ID = "button1";
Panel1.Controls.Add(button);

AjaxControlToolkit.ConfirmButtonExtender confirmDeleteExt = new AjaxControlToolkit.ConfirmButtonExtender();
confirmDeleteExt.TargetControlID = "button1";
confirmDeleteExt.ConfirmText = "Are you sure?";
Panel1.Controls.Add(confirmDeleteExt);

Excellent!

Thanks a lot for your help!

I thought this problem was related to IDs, but is this a bug or is this by design?