This property returns the gadget parent for this box. Since not all boxes are part
of gadgets, this property returns null for those boxes that are not part of a
gadget.
function GetGadgetTagFromChildBox(boxId)
{
var gadgetTag = "";
var box = scene.getBoxById(boxId);
if (box)
{
var gadg = box.gadgetParent;
if (gadg)
gadgetTag = gadg.tag;
}
}