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
ContentException.DESIGN_EXCEPTION_SLOT_NOT_FOUND );
		if ( !containerDefn.canContain( content ) )
			throw ContentExceptionFactory.createContentException( focus,
					content, ContentException.DESIGN_EXCEPTION_WRONG_TYPE );
		
		if ( element.isContentOf( content ) )
			throw ContentExceptionFactory.createContentException( focus,
					content, ContentException.DESIGN_EXCEPTION_RECURSIVE );
		
		if ( !focus.isContainerMultipleCardinality( )
				&& focus.getContentCount( module ) > 0 )
		{
			throw ContentExceptionFactory.createContentException( focus,
					ContentException.DESIGN_EXCEPTION_SLOT_IS_FULL );
		}
	}
	/**
	 * Performs the action to add the given element.
	 * 
	 * @param newPos
	 *            the new position to add
	 * @param content
	 *            the element
	 * @throws ContentException
	 * @throws NameException
	 */
	protected void doAdd( int newPos, DesignElement content )
			throws ContentException, NameException
	{