Can I add ASP.NET AJAX Extentions to a page programmatically (server side)?

Question

In a page, on the load event, I am dynamically creating controls for display on the page. This is all working properly. the trouble I am having is when adding extenders from the AJAX control toolkit, specifically I am trying to add rounded corners to a button control. No errors are thrown, but the AJAX Extension functionality does not appear in the displayed page.

Does anyone have any ideas on what I am not doing correctly, or if its even possible?

Dim container As HtmlGenericControl
Dim edit As Button
Dim editRoundedCorners As AjaxControlToolkit.RoundedCornersExtender 

For each item in items
            container = New HtmlGenericControl("div")
            container.ID = "container_" & item.code

            edit = New Button()
            edit.ID = "edit_" & item.code
            edit.Text = "Edit"
            edit.Style("padding") = "0 0 0 4px"
            edit.SkinID = "smallEditButton"

            editRoundedCorners = New AjaxControlToolkit.RoundedCornersExtender()
            editRoundedCorners.BorderColor = edit.BorderColor
            editRoundedCorners.ID = edit.ID & "_RoundedCorners"
            editRoundedCorners.Corners = AjaxControlToolkit.BoxCorners.All
            editRoundedCorners.Radius = 3
            editRoundedCorners.TargetControlID = edit.ID

            container.Controls.Add(editRoundedCorners)
            container.Controls.Add(edit)
            pageContainer.Controls.Add(container)
Next

(pageContainer is a div on the page)

Answer 1

You need to add the "editRoundedCorners" to the page, or containers, Controls collection, so try adding the line:

Controls.Add(editRoundedCorners)

just before "'add them to page control collection" as you may only be adding the edit button, whereas both are required.

Answer 2

I'm using C#, so I'll be using that syntax.

As Rob said, you'll need to add the Extender to the page. You can do this by:

*parentCtrl*.Controls.Add(*extendername*);

or, alternatively

*controltype* *controlname* = (*controltype*)Page.LoadControl(typeof(*controltype*), new object[]{});

If you're passing parameters on to the control, put them in the object array.

Answer 3

You cannot apply a RoundedCornersExtender to input elements such as TextBox or Buttons.