B4J Question how can if realize if webview is fully loaded

 Private fx As JFX
 Private MainForm As Form
 Dim wv As WebView
 Dim engine As JavaObject
 Dim loaded As Object
End Sub
Sub AppStart (Form1 As Form, Args() As String)
 MainForm = Form1
 'MainForm.RootPane.LoadLayout("Layout1") 'Load the layout file.
 MainForm.Show
' initialize the webview (not needed if from designer)
 wv.Initialize("wv")

' get the web engine from the webview
 engine = asJO(wv).RunMethodJO("getEngine",Null)

' create the event
 loaded = engine.CreateEvent("javafx.beans.value.ChangeListener","pageLoaded",Null)

' add the event to the loadworker state 
engine.RunMethodJO("getLoadWorker",Null).RunMethodJO("stateProperty",Null).RunMethod("addListener",Array(loaded)) 

' add webview to mainform etc & get a page 
MainForm.RootPane.AddNode(wv,10,10,400,400)
 wv.LoadUrl("http://www.google.co.uk")
End Sub

Sub pageLoaded_Event (MethodName As String, Args() As Object) As Object
 Dim state As String = Args(2)  ' args(2) contains the info we want
 If state.EqualsIgnoreCase("succeeded") Then
  Log("page loaded") 
 End If
 Return Null
End Sub 
' just for creating javaobjects from existing objects
Sub asJO(o As JavaObject) As JavaObject
 Return o
End Sub