XPGetNthChildWidget

WIDGET_API XPWidgetID XPGetNthChildWidget(
                         XPWidgetID           inWidget,    
                         int                  inIndex);    

This routine returns the widget ID of a child widget by index. Indexes are 0 based, from 0 to one minus the number of widgets in the parent, inclusive. If the index is invalid, 0 is returned.