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
if ( targetObj instanceof ColumnHandle )
				{
					return handleValidateContainColumnPaste( (ColumnHandle) targetObj,
							(ColumnBandData) transferData,
							false ) ? CONTAIN_PARENT : CONTAIN_NO;
				}
				return CONTAIN_NO;
			}
			else if ( transferData instanceof IDesignElement )
			{
				DesignElementHandle childHandle = ( (IDesignElement) transferData ).getHandle( SessionHandleAdapter.getInstance( )
						.getReportDesignHandle( )
						.getModule( ) );
				return handleValidateTargetCanContainByContainer( targetObj,
						childHandle,
						validateContainer );
			}
			else if ( transferData instanceof SlotHandle )
			{
				SlotHandle slot = (SlotHandle) transferData;
				Object[] childHandles = slot.getContents( ).toArray( );
				return handleValidateTargetCanContainByContainer( targetObj,
						childHandles,
						validateContainer );
			}
			else if ( transferData instanceof IStructure )
			{
				return handleValidateTargetCanContainStructure( targetObj,
						(IStructure) transferData ) ? CONTAIN_THIS : CONTAIN_NO;
			}