zkbind.$(someone).command('dataChange', {data:{title: "myData"}});

public static class DataObject {
	private String title;
	public void setTitle(String title) {
		this.title = title;
	}
	public String getTitle() {return title;}
}
@Command
public void dataChange(@BindingParam("data") DataObject data) {
	// do something here.
}