grid based game

I have 7*6 based grid total of 42 grid . I have gui based 5 objects like bag - it will consume 6 grid cell phone - 4 grid passport - 1 grid formal shirt - 8 grid key - 3 grid I have used gui based drag and drop in to this grid it is working fine .I got stuck if i place the cell phone inside the 4 grid inside any where in the 7*6 based grid object if i place any other object over this cell phone the object in gui place should go back to the old place.So how the postion of cell phone inside the grid with out using rect.contains.I have tried it require lot of code.Is there any way to find a gui is over lapping another gui.