code: public GridCellElement<P> removeElement(P element) {
  		final GridCellElement<P> elt = remove(element);
  		if (elt != null) {
  			if (elt.removeCellLink(this)) {
  				--this.referenceElementCount;
  			}
  		}
  		return elt;
  	}
docs: Remove the specified element from the cell.
  
  @param element the element.
  @return the removed grid-cell element.