This (deprecated) routine is used to set the transparency of widget backgrounds. It is recommended that the developer instead just set the correct transparency when the color is initially provided to the widget.
int IWidget_SetBGTransparency(IWidget *pif, int nTrans)
AEE_SUCCESS - The background transparency was successfully set. AEE_EFAILED - Unable to set the background transparency.
The transparency will be set to the provided value.