| 
 | virtual | 
Selects the specified rounded rectangle as clipping region for a device content.
| rectRounded | The rounded rectangle. | 
| nFlags | This parameter can be one of the following values: RGN_COPY (by default), RGN_AND, RGN_DIFF, RGN_OR or RGN_XOR | 
See Windows SDK SelectClipPath function documentation for information about RGN_ flags.
Call ReleaseClipArea() method to remove the clipping region.