OnClick not being called on Ipad for Vbox

<window  id="_homeWindow" border="normal" apply="com.dh.ui.ipad.view.DHzHomeView"  height="100%" width="100%" >	
<vbox id="_test" width="200px" height="200px" style="background-color:red" >
<label value="TEST"/>

<image  sclass="dhVideoSector"></image>

</vbox>

<window>

public class DHzHomeView extends GenericForwardComposer
{
....

	public void onClick$_test(Event event)
	{
		Messagebox.show("test Clicked");
	}