The following functions are specific to RowColumn functionality, but reside in the GeoUtils implementation.
I don't know what this first function does, but it looks suspiciously like a GeoMatrix allocation function, specialized for RCKidGeometry.
XmKidGeometry _XmGetKidGeo(Widget wid, Widget instigator, XtWidgetGeometry *request, int uniform_border, Dimension border, int uniform_width_margins, int uniform_height_margins, Widget help, int geo_type);
_XmRCGetKidGeoThere is an undocumented function, XmRCGetKidGeo(), that I believe is similar to _XmGeoMatrixGet(). In LESSTIF, I believe this is implemented as initialize_boxes() in RowColumn.c.
That function calls this next function, as well as _XmGeoLoadValues().
int _XmGeoCount_kids(CompositeWidget c);
Anybody out there who knows that this function does?