question: public boolean nextTile ( ) throws ModelControlException { boolean movedToRow = super . nextTile ( ) ; if ( movedToRow ) { curTile = getTileIndex ( ) ; setDisplayFieldValue ( TXT_PARENT_INDEX , parentIdx ) ; setDisplayFieldValue ( TXT_CHOICE , choices [ curTile ] ) ; setDisplayFieldValue ( TXT_INDEX , Integer . toString ( curTile ) ) ; } return movedToRow ; }
target:  moves the current tile position to the next available tile.