Bug 134949 Themes nest in other library
Details: Themes nest in other library Step: 1. Library A use LibraryB, and Library B has a themes 2. Report design use Library A 3. I open the Library tree of A in library explorer and drop the themes from B into layout. Actual result: It pop up an error message and said that the library namespace "B" exists already. Exception result: I don't konw if I can use by this method. But I think it is a method user may be used.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/views/attributes/providers/ChoiceSetFactory.java
* 
	 * @return A String array contains all the Styles.
	 */
	public static String[] getStyles( )
	{
		ArrayList list = new ArrayList( );
		list.add( CHOICE_NONE );
		Iterator iterator = DEUtil.getStyles( );
		if ( iterator != null )
		{
			while ( iterator.hasNext( ) )
			{
				ReportElementHandle elementHandle = (ReportElementHandle) iterator.next( );
				list.add( elementHandle.getDisplayLabel() );
			}
		}
		return (String[]) list.toArray( new String[0] );
	}
	/**
	 * Gets all available themes .
	 * 
	 * @return A String array contains all available themes.
	 */
	public static String[] getThemes( )
	{
		ArrayList list = new ArrayList( );
		list.add( CHOICE_NONE );
		ModuleHandle handle = SessionHandleAdapter.getInstance( )
				.getReportDesignHandle( );
		Iterator iterator = handle.getAllThemes( ).iterator( );