}
public void refreshChildren()
{
ContainerShapePresentation presentation = getContainerShapePresentation();
presentation.refreshChildren();
List<ShapeModel> refreshedChildren = new ArrayList<ShapeModel>();
for (ShapePresentation shapePresentation : presentation.getChildren()) {
// find existing ShapeModel
ShapeModel childModel = getChildShapeModel(shapePresentation);
if (childModel == null) {