textblock 크기에따라서 자동으로 width 바꾸기

 <Grid x:Name="LayoutRoot">
  <Button HorizontalAlignment="Left" Margin="115,-80,0,0" Style="{DynamicResource csButton}" Width="{Binding Path=ActualWidth, ElementName=grid, Mode=Default}" Height="26">
   <Grid Width="Auto" Height="Auto" x:Name="grid">
    <Grid.ColumnDefinitions>
     <ColumnDefinition MinWidth="29.28" Width="Auto"/>
     <ColumnDefinition MinWidth="90.72" Width="Auto"/>
    </Grid.ColumnDefinitions>
    <Image Margin="5,0,4,0" VerticalAlignment="Center" Height="16" RenderTransformOrigin="1.425,1.524" Source="Button style2_1.png" Stretch="Fill"/>
    <TextBlock Margin="8,0,8,0" x:Name="textBlock" Foreground="#FF505050" TextWrapping="Wrap" d:LayoutOverrides="Height" VerticalAlignment="Center" Grid.Column="1" Text="Add iControl"/>
   </Grid>
  </Button>

예제 파일

invalid-file