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I'm using the new telerik binaries for silverlight 5, the 227 one. When I set the default button width in my styles, the Filter icon width on the columns changes ( ShowDistinctFilters="True"). I could do this with no problems in the 2011 binaries.
<
Style
TargetType
=
"Button"
>
<
Setter
Property
=
"Width"
Value
=
"120"
/>
</
Style
>