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.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
.getLocalGraphicsEnvironment( );
		String[] fontNames = ge.getAvailableFontFamilyNames( );
		if ( comparator != null )
		{
			Arrays.sort( fontNames, comparator );
		}
		return fontNames;
	}
	/**
	 * Gets the tool used to process multil-selection.
	 * 
	 * @param modelList
	 *            DE model list.
	 * @return The tool used to process multil-selection.
	 */
	public static GroupElementHandle getMultiSelectionHandle( List modelList )
	{
		ModuleHandle designHandle = SessionHandleAdapter.getInstance( )
				.getReportDesignHandle( );
		GroupElementHandle handle = GroupElementFactory.newGroupElement(
				designHandle, modelList );
		return handle;
	}
	/**
	 * Escapes \ and " following standard of Javascript
	 * 
	 * @param str
	 * @return new string after escape special character
	 */
	public static String escape( String str )