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Subclass command bar in Internet Explorer
internal delegate int Win32WndProc(IntPtr hWnd, int Msg, int wParam, int lParam);
private Win32WndProc newBodyProc = new Win32WndProc(BodyProc);
public IntPtr oldBodyProc = SetWindowLong(handle for "Internet Explorer_Server", GWLP_WNDPROC, newBodyProc);
private int BodyProc(IntPtr hWnd, int Msg, int wParam, int lParam)
{
  switch (Msg)
  {
     msgs to be filtered....
   }
 }