AJAX TabPanels and user defined controls

Hi,

I've built a control in which I implement the behaviour described in this video:How Do I: Trigger an UpdatePanel Refresh from a DropDownList Control? Basically, I want to update the nodes of a TreeView when I change the item in a DropDownList.

This works great except if I load the control dynamically into a tab panel...In this case, the first SelectedIndexChanged event doesn't trigger anything and all of the following events trigger a full page postback...

So, to sum this up:

User control statically defined in a page -> OKUser control statically defined in a tab panel -> OK (it works when I put the code of the control inside the tab panel)User control dynamically loaded into a placeholder -> OK (using PlaceHolder1.Controls.Add(Page.LoadControl("WebUserControl.ascx"));)User control dynamically loaded into a tab panel -> NOT OK! (using both TabPanel1.Controls.Add(Page.LoadControl("WebUserControl.ascx")); and TabPanel1.ContentTemplate = Page.LoadTemplate("WebUserControl.ascx");)

I can't put the code of the control inside the tab panel statically (point 2 in the previous list) because the tab panels are being generated dynamically also...

Anyone has suggestions to solve this, please??

When are you adding these dynamically created controls? It sould be during the Page_Init event and not later (such as during the Page_Load).

I'm not adding the controls in the Page_Init as I can't do that...when my page first loads it has only a DropDownList with a list of options.

Then, when the selected option is changed, there is a postback (as the DropDownList has AutoPostBack = "True") and only then the tabs are created and the user control is loaded.

The user defined control is being rendered and is visible, but its behaviour is strange...

If you dynamically add your contorls into an updatepanel, the issue comes.

There are few good articles written byScott Mitchell on dynamically loading Controls which you will find in the following links:

Dynamic Controls in ASP.NETWorking with Dynamically Created ControlsDynamic Web Controls, Postbacks, and View State