Bug 188027 PasteAction is diabled
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/ContainerContext.java
if ( focus.getElement( ).isVirtualElement( )
					|| focus.getElement( ).getExtendsName( ) != null )
				return false;
			
			ContainerContext containerInfo = this.focus;
			while ( containerInfo != null )
			{
				DesignElement container = containerInfo.getElement( );
				if ( container instanceof ListingElement
						|| container instanceof MasterPage )
				{
					List errors = container.checkContent( module, this.focus,
							defn );
					return errors.isEmpty( );
				}
				containerInfo = container.getContainerInfo( );
			}
			return retValue;
		}
		/**
		 * Determines if the slot can contain a given element.
		 * 
		 * @param module
		 *            the module
		 * @param element
		 *            the element to insert
		 * @return a list containing exceptions.
		 */
		public final List checkContainmentContext( Module module,
				DesignElement element )