ZK 6 (binding to css properties)

package j35jf0ka$v1;
import java.util.*;
import org.zkoss.lang.Objects;
public class TestForm {
	private String _id;
	private String _name;
	private Map<String, Object> _init = new HashMap<String, Object>();
	private Map<String, Object> _dirty = new HashMap<String, Object>();
	public TestForm () {
 
	}
	public TestForm (String id, String name) {
		setId(id);
		setName(name);
		reset(id, name);
	}
	public String getId () {
		return _id;
	}
	public void setId (String id) {
		_id = id;
		updateDirty("id", _id);
	}
	public String getName () {
		return _name;
	}
	public void setName (String name) {
		_name = name;
		updateDirty("name", _name);
	}
	public void reset () {
		reset (getId(), getName());
	}
	public void reset (String id, String name) {
		_init.put("id", id);
		_init.put("name", name);
		updateDirty("id", _id);
		updateDirty("name", _name);
	}
	public Map getDirty() {
		return _dirty;
	}
	public void updateDirty (String attr, Object value) {
		if (!org.zkoss.lang.Objects.equals(_init.get(attr), value))
			_dirty.put(attr, new Boolean(true));
		else
			_dirty.put(attr, new Boolean(false));
	}
}

package j35jf0ka$v1;

import java.util.*;
import org.zkoss.bind.ValidationContext;
import org.zkoss.bind.Validator;
import org.zkoss.bind.annotation.Command;
import org.zkoss.bind.annotation.NotifyChange;
import org.zkoss.zul.*;
public class TestVM {
	private TestForm _form;
	public TestForm getForm () {
		if (_form == null)
			_form = new TestForm ("id", "name");
		return _form;
	}
	public void setForm (TestForm form) {
		_form = form;
	}
	@Command @NotifyChange("form")
	public void updateAll() {}
	@Command @NotifyChange("form")
	public void reset () {
		getForm().reset();
	}
}

<zk>
	<style>
		.dirty {
			color: #AA2222;
		}
	</style>
	<window apply="org.zkoss.bind.BindComposer"
		viewModel="@id('vm') @init('j35jf0ka$v1.TestVM')">
		<groupbox hflex="true" mold="3d">
			<grid hflex="true" >
				<columns>
					<column width="120px"/>
					<column/>
				</columns>
				<rows>
					<row>
						<textbox value="@bind(vm.form.id)" sclass="@load(vm.form.dirty.id?'dirty':'')"
							onChange="@command('updateAll')" />
					</row>
					<row>
						<textbox value="@bind(vm.form.name)" sclass="@load(vm.form.dirty.name?'dirty':'')"
							onChange="@command('updateAll')" />
					</row>
				</rows>
			</grid>
		</groupbox>
		<button onClick="@command('reset')" label="set current value as default" />
	</window>
</zk>