diff --git a/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/DateTimeUpDown/Implementation/DateTimeUpDown.cs b/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/DateTimeUpDown/Implementation/DateTimeUpDown.cs
index 082ec6ab..cc3876c6 100644
--- a/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/DateTimeUpDown/Implementation/DateTimeUpDown.cs
+++ b/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/DateTimeUpDown/Implementation/DateTimeUpDown.cs
@@ -27,6 +27,17 @@ namespace Microsoft.Windows.Controls
 
         //TODO: add minimum and maximum properties
 
+        #region DefaultValue
+
+        public static readonly DependencyProperty DefaultValueProperty = DependencyProperty.Register("DefaultValue", typeof(DateTime), typeof(DateTimeUpDown), new UIPropertyMetadata(DateTime.Now));
+        public DateTime DefaultValue
+        {
+            get { return (DateTime)GetValue(DefaultValueProperty); }
+            set { SetValue(DefaultValueProperty, value); }
+        }
+
+        #endregion //DefaultValue
+
         #region Format
 
         public static readonly DependencyProperty FormatProperty = DependencyProperty.Register("Format", typeof(DateTimeFormat), typeof(DateTimeUpDown), new UIPropertyMetadata(DateTimeFormat.FullDateTime, OnFormatChanged));
@@ -78,18 +89,6 @@ namespace Microsoft.Windows.Controls
 
         #endregion //FormatString
 
-        #region NullValue
-
-        public static readonly DependencyProperty NullValueProperty = DependencyProperty.Register("NullValue", typeof(DateTime), typeof(DateTimeUpDown), new UIPropertyMetadata(DateTime.Now));
-        public DateTime NullValue
-        {
-            get { return (DateTime)GetValue(NullValueProperty); }
-            set { SetValue(NullValueProperty, value); }
-        }
-
-
-        #endregion //NullValue
-
         #region Value
 
         public static readonly DependencyProperty ValueProperty = DependencyProperty.Register("Value", typeof(DateTime?), typeof(DateTimeUpDown), new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, OnValueChanged, OnCoerceValue));
@@ -172,7 +171,7 @@ namespace Microsoft.Windows.Controls
             if (Value.HasValue)
                 UpdateDateTime(1);
             else
-                Value = NullValue;
+                Value = DefaultValue;
         }
 
         protected override void OnDecrement()
@@ -180,7 +179,7 @@ namespace Microsoft.Windows.Controls
             if (Value.HasValue)
                 UpdateDateTime(-1);
             else
-                Value = NullValue;
+                Value = DefaultValue;
         }
 
         protected override void OnPreviewKeyDown(KeyEventArgs e)
diff --git a/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/NumericUpDown/Implementation/NumericUpDown.cs b/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/NumericUpDown/Implementation/NumericUpDown.cs
index 2e054b71..296562fa 100644
--- a/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/NumericUpDown/Implementation/NumericUpDown.cs
+++ b/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/NumericUpDown/Implementation/NumericUpDown.cs
@@ -19,6 +19,17 @@ namespace Microsoft.Windows.Controls
 
         #region Properties
 
+        #region DefaultValue
+
+        public static readonly DependencyProperty DefaultValueProperty = DependencyProperty.Register("DefaultValue", typeof(decimal), typeof(NumericUpDown), new UIPropertyMetadata(default(decimal)));
+        public decimal DefaultValue
+        {
+            get { return (decimal)GetValue(DefaultValueProperty); }
+            set { SetValue(DefaultValueProperty, value); }
+        }
+
+        #endregion //DefaultValue
+
         #region Minimum
 
         public static readonly DependencyProperty MinimumProperty = DependencyProperty.Register("Minimum", typeof(decimal), typeof(NumericUpDown), new PropertyMetadata(Decimal.MinValue, OnMinimumPropertyChanged));
@@ -86,18 +97,6 @@ namespace Microsoft.Windows.Controls
 
         #endregion //FormatString
 
-        #region NullValue
-
-        public static readonly DependencyProperty NullValueProperty = DependencyProperty.Register("NullValue", typeof(decimal), typeof(NumericUpDown), new UIPropertyMetadata(default(decimal)));
-        public decimal NullValue
-        {
-            get { return (decimal)GetValue(NullValueProperty); }
-            set { SetValue(NullValueProperty, value); }
-        }
-        
-
-        #endregion //NullValue
-
         #region SelectAllOnGotFocus
 
         public static readonly DependencyProperty SelectAllOnGotFocusProperty = DependencyProperty.Register("SelectAllOnGotFocus", typeof(bool), typeof(NumericUpDown), new PropertyMetadata(false));
@@ -212,7 +211,7 @@ namespace Microsoft.Windows.Controls
             if (Value.HasValue)
                 Value += Increment;
             else
-                Value = NullValue;
+                Value = DefaultValue;
         }
 
         protected override void OnDecrement()
@@ -220,7 +219,7 @@ namespace Microsoft.Windows.Controls
             if (Value.HasValue)
                 Value -= Increment;
             else
-                Value = NullValue;
+                Value = DefaultValue;
         }
 
         protected override void OnPreviewKeyDown(KeyEventArgs e)