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'Windows API provides an undo function

'Do the following declares:

Declare Function SendMessage Lib "User" (ByVal hWnd As _
Integer, ByVal wMsg As Integer, ByVal wParam As _
Integer, lParam As Any) As Long


Global Const WM_USER = &h400
Global Const EM_UNDO = WM_USER + 23

'And in your Undo Sub do the following:

UndoResult = SendMessage(myControl.hWnd, EM_UNDO, 0, 0)
'UndoResult = -1 indicates an error.
 How to use Undo function for Textbox or Combobox

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