Bug 154828 Item from library contant user properties can't delete
Details: Item from library contant user properties can't delete Step: 1.New a library. 2.Add a label and add a user properites. 3.Public the library. 4.New a report design and use the library 5.Drop the label from library explorer into layout. 6.Try to delete it. Actual result: The label from library contant user properties can't be delete. Exception reuslt: The label can be delete.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/ContentCommand.java
* @param content
	 *            the element to move position
	 * @param slotID
	 *            the slot that contains the element
	 * @param newPosn
	 *            the new position within the slot.
	 * @return true if the content can be moved within the slot, otherwise
	 *         false.
	 */
	private boolean canMovePosition( DesignElement content, int slotID,
			int newPosn )
	{
		if ( element instanceof ReportDesign
				&& slotID == ReportDesign.COMPONENT_SLOT )
		{
			List derived = content.getDerived( );
			ContainerSlot slot = element.getSlot( slotID );
			Iterator iter = derived.iterator( );
			while ( iter.hasNext( ) )
			{
				DesignElement child = (DesignElement) iter.next( );
				if ( slot.contains( child ) )
				{
					
					
					if ( slot.findPosn( child ) <= newPosn )
						return false;
				}
			}
			DesignElement e = content.getExtendsElement( );