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
transferSource,
					(ParameterGroupHandle) newContainer );
		}
		else if ( transferSource instanceof DesignElementHandle )
		{
			return new PasteCommand( (DesignElementHandle) transferSource,
					newContainer,
					position,
					isCut );
		}
		else if ( transferSource instanceof IDesignElement )
		{
			return new PasteCommand( (IDesignElement) transferSource,
					newContainer,
					position );
		}
		return null;
	}
	protected static Command pasteParameterGroup( String commandType,
			Object childGroup, ParameterGroupHandle targetGroup )
	{
		CompoundCommand commands = new CompoundCommand( );
		ParameterGroupHandle childHandle = null;
		if ( childGroup instanceof ParameterGroupHandle )
		{
			childHandle = (ParameterGroupHandle) childGroup;
		}
		else if ( DEUtil.isParameterGroup( childGroup ) )
		{
			childHandle = (ParameterGroupHandle) ( (IDesignElement) childGroup ).getHandle( SessionHandleAdapter.getInstance( )