XPGetNthChildWidget

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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 the number of widgets in the parentone minus one, inclusive. If the index is invalid, 0 is returned.