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 null;
		}
		Iterator iterator = moduleHandle.getVisibleThemes( IAccessControl.DIRECTLY_INCLUDED_LEVEL )
				.iterator( );
		if ( iterator != null )
		{
			while ( iterator.hasNext( ) )
			{
				ReportElementHandle elementHandle = (ReportElementHandle) iterator.next( );
				if ( elementHandle.getName( ).trim( ).equals( themeName )
						&& elementHandle.getRoot( ) == libHandle )
				{
					return (ThemeHandle) elementHandle;
				}
			}
		}
		return null;
	}
	public static ThemeHandle applyTheme( ThemeHandle handle,
			ModuleHandle moduleHandle, LibraryHandle library )
	{
		if ( handle.getRoot( ) == moduleHandle )
		{
			try
			{
				moduleHandle.setTheme( handle );
			}
			catch ( SemanticException e )
			{