Bug 146159 [Regression]Changing font operation doesn't work other than the first time
Description: The first time changing operation can work well. However, Change it again, it won't work. Steps: 1.Insert lable/text to layout or master page 2.Change the font from serif to cursive, it works well 3.Change the font again Result: The action doesn't work Additional infor: build number:200606080632
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/util/UIUtil.java
* 
	 * @return the label created
	 */
	public static Label createBlankLabel( Composite parent )
	{
		Label label = new Label( parent, SWT.NONE );
		label.setVisible( false );
		return label;
	}
	/**
	 * Includes the library into within the given module.
	 * 
	 * @param moduleHandle
	 *            the handle module
	 * @param libraryPath
	 *            the full path of the library
	 * @return true if it included successfully, or false if the operation
	 *         failed.
	 */
	public static boolean includeLibrary( ModuleHandle moduleHandle,
			String libraryPath ) throws DesignFileException, SemanticException
	{
		String namespace = getLibraryNamespace( moduleHandle, libraryPath );
		if ( namespace != null )
		{
			moduleHandle.includeLibrary( DEUtil.getRelativedPath( ReportPlugin.getDefault( )
					.getResourcePreference( ),
					libraryPath ),
					namespace );