Combo box template (#2428)

* New combobox template

* Cleaning up the ComboBoxPopup

Obsoleted all of the dead templates

* Setting popup direction to control CornerRadius

* Marking old templates as obsolete

Author: Keboo

MainDemo.Wpf/ComboBoxes.xaml

@@ -38,7 +38,7 @@
                     <Setter Property="Width" Value="96" />
                 </Style>
             </StackPanel.Resources>
-     
+
             <smtx:XamlDisplay UniqueKey="comboboxes_1" Margin="0">
 
                 <ComboBox materialDesign:HintAssist.Hint="OS">
@@ -47,7 +47,7 @@
                     <ComboBoxItem Content="Linux"/>
                     <ComboBoxItem Content="Windows"/>
                 </ComboBox>
-            </smtx:XamlDisplay>           
+            </smtx:XamlDisplay>
             <smtx:XamlDisplay UniqueKey="comboboxes_2">
                 <ComboBox
                     materialDesign:HintAssist.Hint="Search"
@@ -78,7 +78,7 @@
                     materialDesign:TextFieldAssist.HasClearButton="True"
                     materialDesign:TextFieldAssist.SuffixText="sw"
                     materialDesign:TextFieldAssist.UnderlineBrush="{DynamicResource SecondaryHueMidBrush}"
-                    materialDesign:ColorZoneAssist.Mode="Inverted"
+                    materialDesign:ColorZoneAssist.Mode="SecondaryLight"
                     materialDesign:HintAssist.Hint="OS"
                     materialDesign:HintAssist.HelperText="Select one OS"
                     MinWidth="128">

MainDemo.Wpf/FieldsLineUp.xaml

@@ -199,10 +199,10 @@
                     Grid.Column="3"
                     Grid.Row="3"
                     Style="{StaticResource MaterialDesignFilledComboBox}" />
-                <TextBlock
+                <ComboBox
                     Grid.Column="3"
                     Grid.Row="4"
-                    Style="{StaticResource NotAvailable}" />
+                    Style="{StaticResource MaterialDesignOutlinedComboBox}" />
 
                 <DatePicker
                     Grid.Column="4"

MaterialDesignThemes.Wpf/ComboBoxAssist.cs

@@ -1,4 +1,5 @@
-using System.Windows;
+using System;
+using System.Windows;
 
 namespace MaterialDesignThemes.Wpf
 {
@@ -7,16 +8,19 @@ public static class ComboBoxAssist
         /// <summary>
         /// By default ComboBox uses the wrapper popup. Popup can be switched to classic Windows desktop view by means of this attached property.
         /// </summary>
+        [Obsolete("ClassicMode is now obsolete and has no affect.")]
         public static readonly DependencyProperty ClassicModeProperty = DependencyProperty.RegisterAttached(
             "ClassicMode",
             typeof(bool),
             typeof(ComboBoxAssist),
             new FrameworkPropertyMetadata(false,
                 FrameworkPropertyMetadataOptions.AffectsRender | FrameworkPropertyMetadataOptions.Inherits));
 
+        [Obsolete("ClassicMode is now obsolete and has no affect.")]
         public static bool GetClassicMode(DependencyObject element)
             => (bool)element.GetValue(ClassicModeProperty);
 
+        [Obsolete("ClassicMode is now obsolete and has no affect.")]
         public static void SetClassicMode(DependencyObject element, bool value)
             => element.SetValue(ClassicModeProperty, value);