<com:TContent ID="Content"> <h1>Active Panel replacement tests </h1> <com:TCallback ID="callback1" OnCallback="callback1_requested" /> <com:TActivePanel ID="panel1"> <com:TPlaceHolder ID="content1" Visible="false"> Something lalala <com:TButton ID="button1" Text="Button Text"/> </com:TPlaceHolder> </com:TActivePanel> <div id="div1" style="border:1px solid #666; background-color: #ffe; text-align: center; padding:3em"> Click Me! </div> <com:TClientScript> Event.OnLoad(function() { Event.observe($("div1"), "click", function() { Prado.Callback("<%= $this->callback1->UniqueID %>") }) }); </com:TClientScript> </com:TContent>