Bug 126658 [CommonNavigator] [DND] Complete definition of DND API
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/extensions/NavigatorContentDescriptor.java
*             created for any reason
	 * 
	 */
	public ITreeContentProvider createContentProvider() throws CoreException {
		return (ITreeContentProvider) configElement
				.createExecutableExtension(ATT_CONTENT_PROVIDER);
	}
	/**
	 * 
	 * The content provider could be an instance of {@link ICommonLabelProvider},
	 * but only {@link ILabelProvider} is required.
	 * 
	 * @return An instance of the Label provider defined for this extension
	 * @throws CoreException
	 *             if an instance of the executable extension could not be
	 *             created for any reason
	 */
	public ILabelProvider createLabelProvider() throws CoreException {
		return (ILabelProvider) configElement
				.createExecutableExtension(ATT_LABEL_PROVIDER);
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.internal.navigator.extensions.INavigatorContentDescriptor#isEnabledByDefault()
	 */
	public boolean isActiveByDefault() {
		return activeByDefault;
	}
	/**