add function codes

src/Shared/HandyControl_Shared/Tools/Extension/DependencyObjectExtension.cs

@@ -0,0 +1,18 @@
+using System.Windows;
+using System.Windows.Media;
+
+namespace HandyControl.Tools.Extension
+{
+    public static class DependencyObjectExtension
+    {
+        public static DependencyObject GetVisualOrLogicalParent(this DependencyObject sourceElement)
+        {
+            return sourceElement switch
+            {
+                null => null,
+                Visual _ => (VisualTreeHelper.GetParent(sourceElement) ?? LogicalTreeHelper.GetParent(sourceElement)),
+                _ => LogicalTreeHelper.GetParent(sourceElement)
+            };
+        }
+    }
+}