add some more native functions for Highlighter

Pilz.Win32/Native/User32.vb

@@ -0,0 +1,17 @@
+Imports System.Runtime.InteropServices
+
+Namespace Native
+
+    Public Class User32
+
+        <DllImport("user32")>
+        Public Shared Function GetWindowRect(ByVal hWnd As IntPtr, ByRef r As RECT) As Boolean
+        End Function
+
+        <DllImport("user32.dll")>
+        Public Shared Function ChildWindowFromPointEx(ByVal hWndParent As IntPtr, ByVal pt As POINT, ByVal uFlags As UInteger) As IntPtr
+        End Function
+
+    End Class
+
+End Namespace