How can I get an UpdatePanel to intercept a CompositeControl's DropDownList

Question

I have a CompositeControl that contains a DropDownList.

I have set the AutoPostBack property of the DropDownList to true.

On the page, I have:

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Answer 1

I had repeating child controls (textbox and labels) in a ListView, inside an UpdatePanel.

Changing the textbox would cause a full (synch) postback.

I added the PAGE element (the first line in the .aspx page) : ClientIDMode="AutoID"

This fixed the problem for me, and now only the UpdatePanel refreshes - as desired.