When use native tag to render row's cells, it doesn't works fine with zkmax.jar

Test on ZK 5.0.11, ZK 6.5.0

Refer to the listaExampleStatic2.zul
without zkmax.jar, it works fine.
with zk.max, the HtmlNativeComponent will merge multiple cells into one cell, refer to HtmlNativeComponent.ExtraCtrl

Workaround: user can extends HtmlNativeComponent and override the getExtraCtrl() to avoid merge multiple cells into one cell