ZK 3.5.0 Tabbox and Listbox weird behavior

<tabbox id="mainTabbox">
  <tabs>
    <tab id="productsTab" label="Products"></tab>
    <tab id="vendorsTab" label="Vendors"></tab>
    <tab id="categoriesTab" label="Categories"></tab>
    <tab id="reportsTab" label="Reports"></tab>
  </tabs>
  <tabpanels>
    <tabpanel>
      <window id="reportsWin" width="1140px">
        <tabbox id="reportTypeTabbox" width="100%">
          <tabs>
            <tab id="criticalReportsTab" label="Critical"/>
            <tab id="salesReportsTab" label="Sales"/ >
            <tab id="inventoryReportsTab" label="Inventory"/>
           </tabs>
           <tabpanels>
           <tabpanel>
             <vbox width="100%">
                ...
		<listbox id="reportsCriticalExpiryDateList" width="1050px" height="250px">
		  <listhead sizable="true">
			<listheader label="Product Name" width="300px"></listheader>
			<listheader label="Qty" width="75px"></listheader>
			<listheader label="Purch.Qty" width="75px"></listheader>
			<listheader label="Vendor" width="290px"></listheader>
			<listheader label="Last Purchase Date" width="110px"></listheader>
			<listheader label="Expiry Date" width="100px"></listheader>
		  </listhead>
		</listbox>
          <button label="Print" sclass="button" width="90px" onClick="print.PrintManager.printCriticalExpiryDate()"></button>
	  <button label="Refresh All" onClick="report.ReportManager.report_refreshCriticalReports()" sclass="button" width="90px"></button>

	public static void report_refreshCriticalExpiryDateList()
	{
		try
		{
			final Window mainWin = (Window) Sessions.getCurrent().getAttribute("mainWin");
			final Window reportsWin = (Window) mainWin.getFellow("reportsWin");

			Listbox criticalExpDateList = (Listbox) reportsWin.getFellow("reportsCriticalExpiryDateList");
			criticalExpDateList.getItems().clear();

			HashMap<String, HashMap<String, String>> criticalExpDate = getCriticalExpiryDateProducts(ConfigManager.IM_CONF.getConfig("critical_expiry_period"));

			String[][] model = new String[criticalExpDate.size()][7];

			int modelIdx = 0;
			for(Iterator i = criticalExpDate.keySet().iterator(); i.hasNext(); modelIdx++)
			{
				String productID = (String) i.next();
				HashMap<String, String> criticalItem = criticalExpDate.get(productID);

				model[0] = productID;
				model[1] = criticalItem.get("name");
				model[2] = criticalItem.get("qty");
				model[3] = criticalItem.get("qty_purchased");
				model[4] = criticalItem.get("vendor");
				model[5] = criticalItem.get("last_purchase_date");
				model[6] = criticalItem.get("expiry_date");
			}

			final class CriticalItemRenderer implements ListitemRenderer
			{
				public void render(Listitem li, Object data)
				{
					// Convert to String[] to avoid parse error
					String[] d = (String[]) data;

					String productID = d[0];
					new Listcell(d[1]).setParent(li);
					new Listcell(d[2]).setParent(li);
					new Listcell(d[3]).setParent(li);
					new Listcell(d[4]).setParent(li);

					//etc
				}
			}

			ListModel strset = new SimpleListModel(model);
			criticalExpDateList.setModel(strset);
			criticalExpDateList.setItemRenderer(new CriticalItemRenderer());
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
	}