I was not aware that the toolkit wrap panel behaves differently but our behavior is by design. the MaxWidth property is controlled by the Silverlight framework, not by us and I think this is how it should work. When max width is set, the Width property has no effect when it is greater than MaxWidth. It can be less however.
How does the toolkit behave? Do you need this functionality? We will consider extending RadWrapPanel so that it can behave both ways.
Please write again if you have other questions.
the Telerik team
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