void Clear();
Deletes (clears) the current selection (if any) in the edit control.
The deletion performed by Clear can be undone by calling the Undo member function.
To delete the current selection and place the deleted contents into the Clipboard, call the Cut member function.
CEdit::CanUndo, CEdit::Undo, CEdit::Copy, CEdit::Cut, CEdit::Paste, WM_CLEAR