private void clearAll(){
  steppableObjects.clear();
  objectSelection.removeAll();
  objectsInCombo.clear();
  selectedObject=null;
  occurrence=0;
  inputChanged();
}

private void clearAll ( ) { steppableObjects . clear ( ) ; objectSelection . removeAll ( ) ; objectsInCombo . clear ( ) ; selectedObject = null ; occurrence = 0 ; inputChanged ( ) ; }
clears all objects from the list .
