RichTextBox 控件中多重撤销重做的源代码。\Declares.Bas ........................................\frmMultiple.frm ........................................\frmMultiple.frx ........................................\Readme.txt ........................................\testUndo.Vbp ........................................\testUndo.vbw ........................................\UndoElement.cls RichTextBox 控件中多重撤销重做的源代码。