Sets or clears the modified flag for an edit control.
BOOL bModified = TRUE
A value of TRUE indicates that the text has been modified, and a value of FALSE indicates it is unmodified. By default, the modified flag is set.
The modified flag indicates whether or not the text within the edit control has been modified. It is automatically set whenever the user changes the text. Its value can be retrieved with the GetModify member function.
For more information, see EM_SETMODIFY in the Windows SDK.
See the example for GetModify.