Silverlight provides the ultimate in flexibility when it comes to styling controls. If you don’t like how something looks you can tweak the template in a tool like Expression Blend quickly and easily and get something completely different.
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Read the complete post at http://weblogs.asp.net/dwahlin/archive/2009/08/27/cleaning-up-the-disabled-state-of-a-silverlight-control-using-expression-blend.aspx