Bug 188829 Move the item ,the trans of the model don't close.
1:New report design. 2:Add a Embedded image. 3:Add another imge , then drag the second imge to the first position. 4:Change the size of the first image. Expected: Image change the size. Now: Image size don't change.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/AbstractContentCommand.java
ContentRecord addRecord;
		if ( newPos == -1 )
		{
			addRecord = new ContentRecord( module, focus, content, true );
		}
		else
		{
			addRecord = new ContentRecord( module, focus, content, newPos );
		}
		addRecord.setEventTarget( eventTarget );
		ActivityStack stack = getActivityStack( );
		stack.execute( addRecord );
	}
	/**
	 * Adds a new element into a container. Virtually all elements must reside
	 * in a container. Containers are identified by a container ID. The
	 * application creates the element object, then adds it to the container
	 * here. The undo of this operation effectively deletes the element.
	 * 
	 * @param content
	 *            the element to add
	 * @param slotID
	 *            the slot in which to add the component
	 * @throws ContentException
	 *             if the content cannot be added into this container.
	 * @throws NameException
	 *             if the name of the content exists in name space.
	 */
	public final void add( DesignElement content ) throws ContentException,
			NameException