Add controls dinamically on a Ajax UpdatePanel

Hello,

i have an Ajax UpdatePanel that gets populated dinamically with a button and a listBox. I choose an item from the ListBox,then i press the button.

In code behind,on the server side,i am checking this:

if (ScriptManager1.IsInAsyncPostBack)

string fromWhere = Request[ScriptManager1.ID];

if (fromWhere.Contains("ButtonID"))

}

}

Thanks