can i supplement asp.net ajax extentions page programmatically (server side)?

in page, bucket event, i am boldly formulating controls arrangement page. operative properly. problem i am carrying adding extenders ajax control toolkit, personally i am perplexing supplement lifeless corners symbol control. errors thrown, nonetheless ajax progression functionality does seem displayed page.

does anyone have any ideas i am doing correctly, the even possible?

dim enclosing htmlgenericcontrol
dim correct button
dim editroundedcorners ajaxcontroltoolkit.roundedcornersextender 

for any vigilant items
            enclosing = new htmlgenericcontrol("div")
            container.id = "container_" & item.code

            correct = 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 div page)