<window title="Test" border="normal" width="100%" height="100%"

        apply="org.zkoss.bind.BindComposer" viewModel="@id('vm') @init('pkg$.TestComposer')">

            <borderlayout>

                <west border="none">

                    <button onClick="@command('toggle')" label="toggle"></button>

                </west>

                <center border="none">

                    <borderlayout>

                        <center border="none">

                            <div>

                                <label value="minimized:" />

                                <label value="true" visible="@load(not vm.visible)" />

                            </div>

                        </center>

                        <south border="none" collapsible="true" open="@load(vm.visible)">

                          <tabbox height="100%">

                            <tabs>

                              <tab>Tab 1</tab>

                            </tabs>

                            <tabpanels>

                              <tabpanel style="overflow-y: auto">Test</tabpanel>

                            </tabpanels>

                          </tabbox>

                        </south>

                    </borderlayout>

                </center>

            </borderlayout>

    </window>

</zk>

​