Enum which describes the Popup Window (Desktop Alert) color theme.

Enumerator
BCGPPopupWindowTheme_VisualManager	The popup window appearance is defined by currently selected Visual Manager theme. This is a default popup style.
BCGPPopupWindowTheme_Black	A dark color theme.
BCGPPopupWindowTheme_White	A white color theme.
BCGPPopupWindowTheme_Gray	A light-gray color theme.
BCGPPopupWindowTheme_VisualManagerToolTip	The popup has the same colors as themed tolltip control.
BCGPPopupWindowTheme_Custom	A custom (user-defined) color theme. Call CBCGPPopupWindow::SetCustomTheme to make your custom appearance of the popup window.