App: Replace DataTemplate/ControlTemplate with TemplateSelector

Elwig/Controls/WineQualityLevelTemplateSelector.cs

@@ -0,0 +1,15 @@
+using System.Windows.Controls;
+using System.Windows;
+
+namespace Elwig.Controls {
+    public class WineQualityLevelTemplateSelector : DataTemplateSelector {
+        public override DataTemplate SelectTemplate(object item, DependencyObject container) {
+            ContentPresenter presenter = (ContentPresenter)container;
+            if (presenter.TemplatedParent is ComboBox) {
+                return (DataTemplate)presenter.FindResource("WineQualityLevelTemplateCollapsed");
+            } else {
+                return (DataTemplate)presenter.FindResource("WineQualityLevelTemplateExpanded");
+            }
+        }
+    }
+}