support for doc

src/Shared/HandyControlDemo_Shared/Tools/Helper/Win32Helper.cs

@@ -0,0 +1,11 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace HandyControlDemo.Tools
+{
+    internal class Win32Helper
+    {
+        [DllImport("user32.dll", ExactSpelling = true, CharSet = CharSet.Auto)]
+        public static extern bool SetForegroundWindow(IntPtr hWnd);
+    }
+}