>Do you mean to use MS Rich Textbox Control instead of EditBox on the form? I have never used MS Rich Textbox control. Does it has a Windows Handler property? But it won't work for me here, since I cannot replace the controls on the exiting form. I am trying to add functions to an exiting application. I can add invisible controls on the form to do the additional functions, but not to replace the existing visible controls which will cause too much adjustment.

Too bad. It (the Rich Text Box control) does have an hWnd property.