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
bool = ( (GridHandle) parent ).canCopyColumn( columnNumber );
				}
				if ( bool && array.length == 1 )
				{
					return true;
				}
				if ( bool && array[1] instanceof CellHandle )
				{
					return true;
				}
				return false;
			}
			for ( int i = 0; i < array.length; i++ )
			{
				if ( checkContainerExists( array[i], array ) )
					continue;
				if ( !handleValidateDragInOutline( array[i] ) )
					return false;
			}
			return true;
		}
		if ( selection instanceof ReportElementModel )
		{
			return handleValidateDragInOutline( ( (ReportElementModel) selection ).getSlotHandle( ) );
		}
		if ( selection instanceof SlotHandle )
		{
			SlotHandle slot = (SlotHandle) selection;
			DesignElementHandle handle = slot.getElementHandle( );
			return slot.getContents( ).size( ) > 0