* located on the target position for drop the dragged tile.
*
* @param posStart, posStop
*/
protected void shiftTiles(int startPos, int stopPos) {
DTPicture DTPtmp = null;
// STEP 1 : Check the direction of shift and set index
int DEC = (startPos - stopPos < 0) ? 1 : -1;
// STEP 2 : Save the first element in a temp variable
panelRack tmpParent = (panelRack) innerRack.getComponent(startPos);