FontQuality bug

If you modify the Buttons.xaml and add FontQuality="ClearType" to the LightBlue button it has no effect. But if you then move the LightBlue button above the Red button so that it becomes the first one all text is rendered in ClearType.

<Button Margin="2" Background="LightBlue"  Cursor="Hand">
   <TextBlock HorizontalAlignment="Center" FontQuality="ClearType">This is Button</TextBlock>
</Button>

Btw, is FontQuality also a property of WPF? Haven't found it in the docs. Is this an XTP extension? In this case you should introduce xtp:Textblock and add it to the new element.

oleg wrote: Hi, Yes, its our extension.

You shouldn't add proprietary extensions to standard elements!
Either introduce xtp:Textblock or add a member to your Markup object where the font quality can be set.