class AbstractComboBoxModel extends AbstractListModel implements ComboBoxModel {
		private Object selectedObject = null;
		public void setSelectedItem(Object item) {
			selectedObject = item;
			//dbg("" + selectedObject);
			fireContentsChanged(this, -1, -1);
		}
		public Object getSelectedItem() {
			return selectedObject;
		}
		public Object getElementAt(int i) {
			if (getCargadoors() != null && i <= getSize()) {
				return getCargadoors().elementAt(i);
			}
			return null;
		}
		public int getSize() {
			if (getCargadoors() != null) {
				return getCargadoors().size();
			}
			return 0;
		}
	}