Update DataGrid sample page to test column bindings

samples/ControlCatalog/Pages/DataGridPage.xaml

@@ -11,12 +11,17 @@
       <Setter Property="Background" Value="{Binding Path=GDP, Mode=OneWay, Converter={StaticResource GDPConverter}}" />
     </Style>
   </UserControl.Styles>
-  <Grid RowDefinitions="Auto,*">
+  <Grid RowDefinitions="Auto,Auto,*">
     <StackPanel Orientation="Vertical" Spacing="4" Grid.Row="0">
       <TextBlock Classes="h1">DataGrid</TextBlock>
       <TextBlock Classes="h2">A control for displaying and interacting with a data source.</TextBlock>
     </StackPanel>
-    <TabControl Grid.Row="1">
+    <StackPanel Grid.Row="1" Spacing="4" Orientation="Horizontal" IsVisible="{Binding #EditableTab.IsSelected}">
+      <TextBlock Text="FontSize:" VerticalAlignment="Center"/>
+      <Slider x:Name="FontSizeSlider" Minimum="5" Maximum="30" Value="14" Width="100" VerticalAlignment="Center" />
+      <CheckBox x:Name="IsThreeStateCheckBox" IsChecked="False" Content="IsThreeState"/>
+    </StackPanel>
+    <TabControl Grid.Row="2">
       <TabItem Header="DataGrid">
         <DataGrid Name="dataGrid1" Margin="12" CanUserResizeColumns="True" CanUserReorderColumns="True" CanUserSortColumns="True" HeadersVisibility="All">
           <DataGrid.Columns>
@@ -39,13 +44,13 @@
           </DataGrid.Columns>
         </DataGrid>
       </TabItem>
-      <TabItem Header="Editable">
+      <TabItem x:Name="EditableTab" Header="Editable">
         <Grid RowDefinitions="*,Auto">
           <DataGrid Name="dataGridEdit" Margin="12" Grid.Row="0">
             <DataGrid.Columns>
-              <DataGridTextColumn Header="First Name" Binding="{Binding FirstName}" Width="2*" />
-              <DataGridTextColumn Header="Last" Binding="{Binding LastName}" Width="2*" />
-              <DataGridCheckBoxColumn Header="Is Banned" Binding="{Binding IsBanned}" Width="*" />
+              <DataGridTextColumn Header="First Name" Binding="{Binding FirstName}" Width="2*" FontSize="{Binding #FontSizeSlider.Value, Mode=OneWay}" />
+              <DataGridTextColumn Header="Last" Binding="{Binding LastName}" Width="2*" FontSize="{Binding #FontSizeSlider.Value, Mode=OneWay}" />
+              <DataGridCheckBoxColumn Header="Is Banned" Binding="{Binding IsBanned}" Width="*" IsThreeState="{Binding #IsThreeStateCheckBox.IsChecked, Mode=OneWay}" />
             </DataGrid.Columns>
           </DataGrid>
           <Button Grid.Row="1" Name="btnAdd" Margin="12,0,12,12" Content="Add" HorizontalAlignment="Right" />