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  protectedvirtual | 
Specifies how grid control handles keyboard.
Override this method in a derived class to specify what keys can start in-place edit.Return TRUE to start in-place edit on nChar.
| nChar | Specifies the virtual-key code of the given key. | 
| nRepCnt | Repeat count | 
| nFlags | Specifies the scan code, key-transition code, previous key state, and context code, as shown in the following list. See CWnd::OnKeyDown for details. |