No visual effect in zk 6.5 on ihone/ipad

<?page title="Auto Generated index.zul"?>
<window title="Hello World!!" border="normal" width="200px">

<label value="You are using: ${desktop.webApp.version}"/>
	<grid id="grcs" style="cursor:pointer" >
		<columns>
			<column label="" />
			<column label="" />
		</columns>
		<rows>
			<row>
				<label value="Cell 1" />
				<label value="Cell 2" />
			</row>
			<row>
				<label value="Cell 1" />
				<label value="Cell 2" />
			</row>
			<row>
				<label value="Cell 1" />
				<label value="Cell 2" />
			</row>
		</rows>
	</grid>	 	
</window>