Fixed bug in DateTimeUpDown when not changing the Format, null exception would occur when changing values.

Added default foreground colors to editors to controls like the DataGrid will not change the foreground color.

ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/DateTimeUpDown/DateTimeUpDown.cs

@@ -22,7 +22,7 @@ namespace Microsoft.Windows.Controls
 
         #region Format
 
-        public static readonly DependencyProperty FormatProperty = DependencyProperty.Register("Format", typeof(DateTimeFormat), typeof(DateTimeUpDown), new UIPropertyMetadata(DateTimeFormat.ShortTime, OnFormatChanged));
+        public static readonly DependencyProperty FormatProperty = DependencyProperty.Register("Format", typeof(DateTimeFormat), typeof(DateTimeUpDown), new UIPropertyMetadata(DateTimeFormat.FullDateTime, OnFormatChanged));
         public DateTimeFormat Format
         {
             get { return (DateTimeFormat)GetValue(FormatProperty); }
@@ -56,6 +56,7 @@ namespace Microsoft.Windows.Controls
         public DateTimeUpDown()
         {
             DateTimeFormatInfo = DateTimeFormatInfo.GetInstance(CultureInfo.CurrentCulture);
+            InitializeDateTimeInfoList();
         }
 
         protected override void OnValueChanged(object oldValue, object newValue)

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

@@ -961,6 +961,7 @@
     <!-- =============================================================================== -->
 
     <Style TargetType="{x:Type local:NumericUpDown}">
+        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.WindowTextBrushKey}}"/>
         <Setter Property="Focusable" Value="False" />
         <Setter Property="Template">
             <Setter.Value>
@@ -988,6 +989,7 @@
     <!-- =============================================================================== -->
     
     <Style TargetType="{x:Type local:DateTimeUpDown}">
+        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.WindowTextBrushKey}}"/>
         <Setter Property="Focusable" Value="False" />
         <Setter Property="Template">
             <Setter.Value>
@@ -1015,6 +1017,7 @@
     <!-- =============================================================================== -->
 
     <Style TargetType="{x:Type local:MaskedTextBox}">
+        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.WindowTextBrushKey}}"/>
         <Setter Property="Focusable" Value="False" />
         <Setter Property="Template">
             <Setter.Value>