improve demo

Author: ButchersBoy

MainDemo.Wpf/TextFields.xaml

@@ -238,5 +238,17 @@
                 </Binding>
             </TextBox.Text>
         </TextBox>
+        <CheckBox Grid.Row="9" Grid.Column="4"
+                  x:Name="DisplaySelectedItemCheckBox"
+                  Margin="0 8 0 0">Display Selected Item In Drop Down</CheckBox>
+        <ComboBox Grid.Row="10" Grid.Column="4" 
+                  materialDesign:ComboBoxAssist.ShowSelectedItem="{Binding ElementName=DisplaySelectedItemCheckBox, Path=IsChecked}"
+                  Margin="0 8 0 8" HorizontalAlignment="Left">
+            <ComboBoxItem IsSelected="True">Apple</ComboBoxItem>
+            <ComboBoxItem>Banana</ComboBoxItem>
+            <ComboBoxItem>Pear</ComboBoxItem>
+            <ComboBoxItem>Orange</ComboBoxItem>
+        </ComboBox>
+
     </Grid>
 </UserControl>

MaterialDesignThemes.Wpf/ComboBoxAssist.cs

@@ -11,6 +11,11 @@ public static class ComboBoxAssist
     {
         #region ShowSelectedItem
 
+        /// <summary>
+        /// By default the selected item his hidden from the drop down list, as per Material Design specifications. 
+        /// To revert to a more classic Windows desktop behaviour, and show the currently selected item again in the drop
+        /// down, set this attached propety to true.
+        /// </summary>
         public static readonly DependencyProperty ShowSelectedItemProperty = DependencyProperty.RegisterAttached(
             "ShowSelectedItem",
             typeof (bool),