public void Add(gxtGeom geom)
        {
            // make associated sap box
            gxtSAPBox addBox = new gxtSAPBox(geom);
            addBox.Update();

            int size = colliderList.Count;
            // if empty or greater than the rest of the collection add to end
            if (colliderList.Count == 0 || addBox.min.X >= colliderList[size - 1].min.X)
                colliderList.Add(addBox);
            // if less than rest of collection insert in front
            else if (addBox.min.X < colliderList[0].min.X)
                colliderList.Insert(0, addBox);
            else
            {
                int idx = 1;
                while (addBox.min.X > colliderList[idx].min.X)
                {
                    idx++;
                }
                colliderList.Insert(idx, addBox);
            }
        }
 private int CompareBoxes(gxtSAPBox x, gxtSAPBox y)
 {
     if (x.min.X < y.min.X)
         return -1;
     if (x.min.X > y.min.X)
         return 1;
     return 0;
 }