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int pascal CheckDlgButton(HWND hBox, int state, BOOL fRedraw)

  This function will set the state of the control specified by hBox to
the value specified by the parameter 'state'. The state can either be
TRUE (non-zero) or FALSE (zero).

Parameters
  hBox is the handle to the dialog box control. The control must be a
   radio button or a checkbox. State can either be TRUE (non-zero) or
   FALSE (zero).
  fRedraw is a boolean which should be TRUE if the toggled button
   should be redrawn, and FALSE otherwise.

Returns
  None.