How to set events inside an Accordion control?

[hanglam]

Hi,



I'm using an Accordion control in which I drop two DropDownList controls inside one of the Accordion Pane. When I select an item in the first DropDownList control, it is supposed to trigger an event to re-populate the items of the second DropDownList control based on the item selected in the First DropDownList control. I set the onSelectedIndexChanged="doSomeProcess()" of the first DropDwonList control. But whenever I select an item on the first DropDownList control, I get this error message "Error: Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method."

How do I set events for DropDownList controls inside an Accordion Pane? Is there something I'm missing here?

Thanks,

Hang