usnotifycode (USHORT)

      Notify code.

      CBN_EFCHANGE

        The content of the entry field control has changed, and the change has been displayed on the screen.
      CBN_MEMERROR
        The entry field control cannot allocate the storage necessary to accommodate window text of the length implied by the EM_SETTEXTLIMIT message.
      CBN_EFSCROLL
        The entry field control is about to scroll horizontally. This can happen in these circumstances:

        • The application has issued a WinScrollWindow call.
        • The content of the entry field control has changed.
        • The caret has moved. The entry field control must scroll to show the caret position.
        CBN_LBSELECT
          An item in the list box control has been selected.
        CBN_LBSCROLL
          The list box is about to scroll.
        CBN_SHOWLIST
          The list box is about to be displayed.
        CBN_ENTER
          The user has depressed the ENTER key or double clicked (single clicked in the case of a drop-down list) on an item in the list box control.

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