diff --git a/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/ChildWindow/Implementation/ChildWindow.cs b/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/ChildWindow/Implementation/ChildWindow.cs
index 79c01bf8..5c449150 100644
--- a/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/ChildWindow/Implementation/ChildWindow.cs
+++ b/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/ChildWindow/Implementation/ChildWindow.cs
@@ -691,6 +691,8 @@ namespace Microsoft.Windows.Controls
         {
             _moveTransform.X += x;
             _moveTransform.Y += y;
+
+            InvalidateArrange();
         }
 
         #endregion //Private