Numeric up/down controls: fixed issue with Control.Focus().

ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/NumericUpDown/Themes/Generic.xaml

@@ -13,9 +13,9 @@
     <Style x:Key="NumericUpDown" TargetType="Control">
         <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
         <Setter Property="BorderThickness" Value="1" />
-        <Setter Property="Focusable" Value="False" />
         <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.WindowTextBrushKey}}"/>
         <Setter Property="HorizontalContentAlignment" Value="Right" />
+        <Setter Property="IsTabStop" Value="False" />
         <Setter Property="VerticalContentAlignment" Value="Center" />
         <Setter Property="Template">
             <Setter.Value>