Create Geokit bounds from many points

Question

Is there a simple way to create a Geokit bounds that encompasses a number of points and/or polygons? I have an application where disjoint groups of polygons form a logical unit and I want to know 'does any part of this logical unit lie on my map'? I could do this by working through all the elements but it would be simpler if on sub-object creation I can update a parent-object bounds object.