Retrieves the bounding rectangle of the drop-down component of the current split button control.
Pointer to a SIZE structure that receives the description of a rectangle.
true if this method is successful; otherwise, false.
Use this method only with controls whose button style is BS_SPLITBUTTON or BS_DEFSPLITBUTTON.
When the split button control is expanded, it can display a drop-down component such as a list control or pager control. This method retrieves the bounding rectangle that contains the drop-down component.
This method initializes the mask member of a BUTTON_SPLITINFO structure with the BCSIF_SIZE flag, and then sends that structure in the BCM_GETSPLITINFO message that is described in the Windows SDK. When the message function returns, this method retrieves the bounding rectangle from the size member of the structure.
This method is supported in Windows Vista and later.
Additional requirements for this method are described in Build Requirements for Windows Vista Common Controls.