DropDownButton: now allows you to tab into the control. Pressing space will open the drop down.

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

@@ -32,7 +32,7 @@
             <Setter.Value>
                 <ControlTemplate TargetType="{x:Type local:DropDownButton}">
                     <Grid x:Name="MainGrid" SnapsToDevicePixels="True">
-                        <ToggleButton x:Name="PART_DropDownButton" Grid.Column="1" IsTabStop="False"
+                        <ToggleButton x:Name="PART_DropDownButton" Grid.Column="1"
                                       IsChecked="{Binding IsOpen, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay}"
                                       IsHitTestVisible="{Binding IsOpen, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource InverseBoolConverter}}" >
                             <ToggleButton.Template>