Improved FacebookDialog UI

winsdkfb/winsdkfb/winsdkfb.Shared/FacebookDialog.xaml

@@ -18,15 +18,16 @@
     </UserControl.Resources>
 
     <Grid x:Name="LayoutRoot" Background="#7F000000">
-        <Grid Margin="20,40">
+        <Grid Margin="20,40" MaxWidth="650" MaxHeight="600">
             <Grid.RowDefinitions>
                 <RowDefinition Height="Auto" />
                 <RowDefinition Height="*"/>
             </Grid.RowDefinitions>
+
             <Button Grid.Row="0" x:Name="closeDialogButton" HorizontalAlignment="Right" VerticalAlignment="Top" 
                     MinWidth="0" MinHeight="0" Width="30" Height="30" 
                     Style="{StaticResource CircleWithCrossButtonKey}" Click="CloseDialogButton_OnClick" FontFamily="Segoe UI Symbol" 
-                    Margin="0,0,0,5" Foreground="{ThemeResource ButtonForegroundThemeBrush}"  />
+                    Margin="0,0,0,5" Foreground="White" />
             <WebView x:Name="dialogWebBrowser" Grid.Row="1" />
         </Grid>
     </Grid>