Input controls: added support to change background color.

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

@@ -968,6 +968,7 @@
                 <ControlTemplate TargetType="{x:Type local:NumericUpDown}">
                     <local:ButtonSpinner x:Name="Spinner" IsTabStop="False">
                         <TextBox x:Name="TextBox" BorderThickness="0" 
+                                 Background="{TemplateBinding Background}"
                                  FontFamily="{TemplateBinding FontFamily}" 
                                  FontSize="{TemplateBinding FontSize}" 
                                  FontStretch="{TemplateBinding FontStretch}"
@@ -996,6 +997,7 @@
                 <ControlTemplate TargetType="{x:Type local:DateTimeUpDown}">
                     <local:ButtonSpinner x:Name="Spinner" IsTabStop="False">
                         <TextBox x:Name="TextBox" BorderThickness="0" 
+                                 Background="{TemplateBinding Background}"
                                  FontFamily="{TemplateBinding FontFamily}" 
                                  FontSize="{TemplateBinding FontSize}" 
                                  FontStretch="{TemplateBinding FontStretch}"
@@ -1023,6 +1025,7 @@
             <Setter.Value>
                 <ControlTemplate TargetType="{x:Type local:MaskedTextBox}">
                     <TextBox x:Name="TextBox" 
+                             Background="{TemplateBinding Background}"
                              FontFamily="{TemplateBinding FontFamily}" 
                              FontSize="{TemplateBinding FontSize}" 
                              FontStretch="{TemplateBinding FontStretch}"