BCGSuite for MFC
BOOL CBCGPMenuButton::m_bRightArrow

Determines the arrow direction.

When the user presses the menu button, it displays a popup menu. The popup menu can be displayed under the button or at the right side of the button. A small arrow is placed near the menu button's text and points to the popup menu's direction.

If the m_bRightArrow member is TRUE, than the popup menu is displayed at the right side; otherwise it is displayed under the button.