*
*/
private void initPropValues() {
if (_north != null)
return;
_north = new AnglePropertySource(_map.getNorth(), Border.NORTH);
_south = new AnglePropertySource(_map.getSouth(), Border.SOUTH);
_west = new AnglePropertySource(_map.getWest(), Border.WEST);
_east = new AnglePropertySource(_map.getEast(), Border.EAST);
_upperLeft = new PointPropertySource(_map.getUpperleft());
_upperRight = new PointPropertySource(_map.getUpperright());
_lowerLeft = new PointPropertySource(_map.getLowerleft());
_lowerRight = new PointPropertySource(_map.getLowerright());
_north.setReadOnly(_readOnly);