DataBindingDemo fix 1144857 by making non-actionable content IsTabStop="False" on MainWindow and AddProductWindow (#308)

* Setting IsTabstop to false for portions of UI that are not meant to be interactive.

* Update AddProductWindow.xaml

Co-authored-by: Mark Harper (DEV) <mharper@windows.microsoft.com>

Author: MarkDHarper

Sample Applications/DataBindingDemo/AddProductWindow.xaml

@@ -119,11 +119,11 @@
             </Border>
             <ContentControl Name="ShortPreview" Grid.Row="1"
                             Content="{Binding}"
-                            HorizontalAlignment="Left" />
+                            HorizontalAlignment="Left" IsTabStop="False" />
             <ContentControl Name="LongPreview" Grid.Row="2"
                             Content="{Binding}"
                             ContentTemplate="{StaticResource DetailsProductListingTemplate}"
-                            HorizontalAlignment="Left" />
+                            HorizontalAlignment="Left" IsTabStop="False" />
         </Grid>
     </Border>
-</Window>
+</Window>

Sample Applications/DataBindingDemo/MainWindow.xaml

@@ -64,7 +64,7 @@
         <ContentControl Name="Detail" Grid.Row="3" Grid.ColumnSpan="3"
                         Content="{Binding Source={StaticResource ListingDataView}}"
                         ContentTemplate="{StaticResource DetailsProductListingTemplate}"
-                        Margin="9,0,0,0" />
+                        Margin="9,0,0,0" IsTabStop="False"/>
         <Button Name="OpenAddProduct" Grid.Row="4" Grid.Column="1" Content="Add Product" HorizontalAlignment="Center"
                 Margin="8"
                 Click="OpenAddProductWindow" />