text: CPushPinFrame
  This class emulates the properties dialogs as seen in
  Microsoft Developer Studio. They sport a push pin button in the top left hand
  corner which when unpinned automatically closes the property dialog when the
  dialog loses focus. The MS implementation seems to use custom draw controls
  which seems a shame when you lose all the functionality provided by the MFC
  property sheet classes. The class of interest is CPushPinFrame and is derived
  from CFrameWnd. It provides a look which is similar to the modal MFC property
  sheets.
  CFrameWnd
  When the property page is correctly setup it will look like:
  CPushPin
  #include "PushPinFrame.h"
  CRuntimeClass
  ChangeAttachedPropertySheet()
  CDemoAppDlg::OnButton1()
  V1.1 (1st June 1999)
  V1.11 (2nd June 1999)
  CPushPin.