close #362

src/Shared/HandyControl_Shared/Controls/Attach/DropDownElement.cs

@@ -0,0 +1,18 @@
+using System.Windows;
+using HandyControl.Data;
+
+namespace HandyControl.Controls
+{
+    public class DropDownElement
+    {
+        public static readonly DependencyProperty ConsistentWidthProperty = DependencyProperty.RegisterAttached(
+            "ConsistentWidth", typeof(bool), typeof(DropDownElement),
+            new FrameworkPropertyMetadata(ValueBoxes.TrueBox, FrameworkPropertyMetadataOptions.Inherits));
+
+        public static void SetConsistentWidth(DependencyObject element, bool value)
+            => element.SetValue(ConsistentWidthProperty, value);
+
+        public static bool GetConsistentWidth(DependencyObject element)
+            => (bool) element.GetValue(ConsistentWidthProperty);
+    }
+}