<zk>
	<zscript><![CDATA[ 

		ArrayList data = new ArrayList();
		for (int i = 1; i <= 42; i++) {
			data.add("Data " + i);
		}

		ListModel dataModel = new SimpleListModel(data);
	 ]]></zscript>
	<grid id="grid" mold="paging"
		pageSize="10" model="${dataModel}" activePage="4">
		<custom-attributes org.zkoss.zul.grid.rod="false"/>
		<columns>
			<column value="Data"/>
		</columns>
	</grid>

	<button id="button" label="Clear">
		<attribute name="onClick"><![CDATA[ 

			ArrayList data = new ArrayList();

			ListModel dataModel = new SimpleListModel(data);
			grid.setModel(dataModel);
			System.out.println("size: " + grid.getPaginal().getTotalSize());
		 ]]></attribute>
	</button>
</zk>