<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Page.Resources>
<Style x:Key="MyStyle">
<Setter Property="Control.Width" Value="200" />
</Style>
<Style x:Key="MyStyle2" BasedOn="{StaticResource MyStyle}">
<Setter Property="Control.Width" Value="300"/>
<Setter Property="Control.FontWeight" Value="Bold" />
<Setter Property="Control.Height" Value="50" />
</Style>
</Page.Resources>
<StackPanel>
<Button Style="{StaticResource MyStyle}" Content="A"/>
<Button Style="{StaticResource MyStyle2}" Content="B"/>
</StackPanel>
</Page>
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