arrow button

Hi all,
Attachment 419
Can some body explain how to draw arrow button like this. Its a triangle on QPushButton which changes the bottom shadow color and top shadow color on clicking.

Thanks in Advance,
Boss

void QToolButton::setArrowType(Qt::ArrowType type)

No It looks totally different, I want black color to be filled in the triangle. Would you
please tell me how to draw a triangle.

Override paint event, use black brush and QPainter::drawPolygon().