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/ContentElementCommand.java
/**
	 * Does some actions when the content is removed from the design tree.
	 * 
	 * @param content
	 *            the content to remove
	 * @param unresolveReference
	 *            status whether to un-resolve the references
	 * @throws SemanticException
	 */
	protected void doMove( DesignElement content,
			ContainerContext toContainerInfor, int newPos )
			throws ContentException
	{
		ActivityStack stack = getActivityStack( );
		String label = ModelMessages
				.getMessage( MessageConstants.MOVE_ELEMENT_MESSAGE );
		stack.startTrans( label, getTransOption( ) );
		DesignElement toMove = makeLocalCompositeValue( content );
		super.doMove( toMove, toContainerInfor, newPos );
		stack.commit( );
	}
	/**
	 * Does some actions when the content is removed from the design tree.
	 * 
	 * @param content
	 *            the content to remove
	 * @param unresolveReference
	 *            status whether to un-resolve the references
	 * @throws SemanticException
	 */