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
return content;
	}
	protected void doAdd( int newPos, DesignElement content )
			throws ContentException, NameException
	{
		ActivityStack stack = getActivityStack( );
		stack.startTrans( ModelMessages
				.getMessage( MessageConstants.ADD_ELEMENT_MESSAGE ),
				getTransOption( ) );
		
		makeLocalCompositeValue( content );
		
		super.doAdd( newPos, content );
		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
	 */
	protected void doDelectAction( DesignElement content )
			throws SemanticException
	{
		DesignElement toRemove = makeLocalCompositeValue( content );
		super.doDelectAction( toRemove );
	}