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
* 
	 * @return the event target
	 */
	private ContentElementInfo getEventTarget( )
	{
		IContainerDefn tmpContainerDefn = focus.getContainerDefn( );
		if ( tmpContainerDefn instanceof SlotDefn )
			return null;
		DesignElement tmpElement = focus.getElement( );
		PropertyDefn tmpPropDefn = (PropertyDefn) tmpContainerDefn;
		ContentElementInfo retTarget = new ContentElementInfo( true );
		while ( tmpElement != null && tmpPropDefn != null )
		{
			retTarget.pushStep( tmpPropDefn, -1 );
			if ( tmpPropDefn.getTypeCode( ) == IPropertyType.CONTENT_ELEMENT_TYPE
					&& !( tmpElement instanceof ContentElement ) )
			{
				retTarget.setTopElement( tmpElement );
				return retTarget;
			}
			ContainerContext context = tmpElement.getContainerInfo( );
			if ( context == null )
				break;
			tmpElement = tmpElement.getContainer( );
			tmpPropDefn = tmpElement
					.getPropertyDefn( context.getPropertyName( ) );
		}
		return null;
	}
}