Bug 126658 [CommonNavigator] [DND] Complete definition of DND API
tests/org.eclipse.ui.tests.navigator/src/org/eclipse/ui/tests/navigator/extension/TestContentProvider.java
}
	/**
	 * @param modelFile
	 */
	private TestExtensionTreeData updateModel(IFile modelFile) {
		Properties model = new Properties();
		if (modelFile.exists()) {
			try {
				model.load(modelFile.getContents());
				TestExtensionTreeData root = new TestExtensionTreeData(null,
						MODEL_ROOT, model);
				rootElements.put(modelFile, root);
				return root;
			} catch (IOException e) {
			} catch (CoreException e) {
			}
		} else {
			rootElements.remove(modelFile);
		}
		return null;
	}
	public Object getParent(Object element) {
		if (element instanceof TestExtensionTreeData) {
			TestExtensionTreeData data = (TestExtensionTreeData) element;
			return data.getParent();
		}
		return null;
	}
	public boolean hasChildren(Object element) {
		if (element instanceof TestExtensionTreeData) {