Bug 156632 [Acceptance]Cannot paste theme when select Themes in Outline.
Description: Cannot paste theme when select Themes in Outline. Steps to reproduce: 1. New a library. 2. Select defaulttheme in outline and cut it 3. Select Themes and right click to paste the theme back. Expected result: Paste in context menu can be used. Actual result: Paste is gray
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DNDUtil.java
* @return if succeeding in operating data
	 */
	protected static boolean operateHandles( Object transferData,
			Object targetObj, int position, String commandName,
			String commandType )
	{
		ModuleHandle designHandle = SessionHandleAdapter.getInstance( )
				.getReportDesignHandle( );
		CommandStack stack = designHandle.getCommandStack( );
		try
		{
			stack.startTrans( commandName );
			CompoundCommand commands = new CompoundCommand( );
			if ( transferData instanceof StructuredSelection )
			{
				transferData = ( (StructuredSelection) transferData ).toArray( );
			}
			addCommandToCompound( transferData,
					targetObj,
					position,
					commandName,
					commandType,
					commands );
			commands.execute( );
			stack.commit( );
		}
		catch ( Exception e )
		{
			stack.rollbackAll( );
			return false;