<zk>
	<window apply="org.zkoss.bind.BindComposer" 
		viewModel="@id('vm')@init('bean.TestModel')">

		<div form="@id('fx')@init(vm.attr)">
			<label value="@load(fx.color)"/>
		</div>
	</window>
</zk>

package bean;

public class TestModel {
	private Attr attr = new Attr("blue");
	
	public Attr getAttr() {
		return attr;
	}
	
	
	public static class Attr {
		private String color;
		public Attr(String color) {
			this.color = color;
		}
		
		public void setColor(String color) {
			this.color = color;
		}
		
		public String getColor() {
			return color;
		}
	}
}