question: public void removeAll ( ) { checkWidget ( ) ; deselectAll ( ) ; vScroll . setSelection ( 0 ) ; hScroll . setSelection ( 0 ) ; focusItem = - 1 ; focusColumn = null ; topIndex = - 1 ; bottomIndex = - 1 ; shiftSelectionAnchorColumn = null ; topColumns . clear ( ) ; columns . clear ( ) ; columnElements = new Object [ 0 ] ; rowElements = new Object [ 0 ] ; }
target:  Removes all of the items from the receiver.