MaskedTextBox: fix bug with not properly handling optional digits represented by 9

Main/Source/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/MaskedTextBox/Implementation/MaskedTextBox.cs

@@ -313,7 +313,7 @@ namespace Microsoft.Windows.Controls
             else if (e.Key == Key.Space)
             {
                 if (provider.InsertAt(" ", position))
-                    UpdateText(provider, position);
+                    UpdateText(provider, ++position);
                 e.Handled = true;
             }
             else if (e.Key == Key.Back)//handle the back space
@@ -395,7 +395,8 @@ namespace Microsoft.Windows.Controls
             {
                 IncludePrompt = this.IncludePrompt,
                 IncludeLiterals = this.IncludeLiterals,
-                PromptChar = this.PromptChar
+                PromptChar = this.PromptChar,
+                ResetOnSpace = false //should make this a property
             };
         }