Thank you for your clarification. Unfortunately this is known limitation to RadHtmlPlaceholder and currently we are not aware of an existing workaround for it. I've added an item in out PITS under the name "HtmlPlaceholder: MouseWheel does not work when setting an HtmlSource"
and it will be available for tracking and voting tomorrow the latest. We will most probably be working on this issue during Q3 2011, since there are more urgent tasks at the moment. I've also updated your Telerik points accordingly.
All the best,
the Telerik team
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