>Is there an Active-X equivalent to the LockScreen property on a form?
>I am using DBI's ctMonth calendar and it takes time to fill it up.

Having an hWnd, you can use the LockWindowUpdate API call:

DECLARE INTEGER LockWindowUpdate IN WIN32API INTEGER hWndToLock
IF LockWindowUpdate(nMyActiveControlHWND) # 0
   *  The Lock succeeded
ELSE
   *  Some other Window is locked already; only one hWnd can be locked at a time
ENDIF
*
*  Do your Stuff
*
=LockWindowUpdate(0)