Bug 210609 [Smoke]Crosstab is failed to preview in runtime
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/extension/ExtendedElementUIPoint.java
private String extensionName;
	private IReportItemFigureProvider reportItemUI = null;
	private Map attributesMap = new HashMap(5);
	private HashMap classMap = new HashMap(2);
	/**
	 * Construct an new instance with the given extension name. All default
	 * value will be initialized.
	 * 
	 * @param extensionName
	 *            the extension name of the extended element