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
* object, then adds it to the container here. The undo of this operation
	 * effectively deletes the element.
	 * 
	 * @param content
	 *            the element to add
	 * @param newPos
	 *            the position index at which the content to be inserted. If
	 *            it's -1, the content will be inserted at the end of the slot.
	 * @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, int newPos )
			throws ContentException, NameException
	{
		assert newPos >= 0 || newPos == -1;
		assert content.getContainer( ) == null;
		if ( eventTarget != null && !( this instanceof ContentElementCommand ) )
		{
			ContentElementCommand attrCmd = new ContentElementCommand( module,
					focus );
			attrCmd.add( content, newPos );
			return;
		}
		try
		{
			checkBeforeAdd( content );
		}
		catch ( ContentException e )