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<Label Width="300">
<Grid Width="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorLevel=1, AncestorType={x:Type Label}}, Path=ActualWidth}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="Auto"></ColumnDefinition>
</Grid.ColumnDefinitions>
<TextBlock Text="111" Grid.Column="1"></TextBlock>
</Grid>
</Label>