[Gambas-user] prb:event programming

[ron]

I have a form Fnavbar

4 buttons in group 
-------------------------
' Gambas class file
EVENT DoNavigation(sBtnTag AS String) 

PUBLIC SUB _new()
  ME.Show
  timernavbtn = ""
  TimerLock = FALSE
END

PUBLIC SUB Navigation_Click()
  DIM ta AS String
  ta = LAST.tag
  PRINT "you clicked:" & ta <-- this works correct
  RAISE DoNavigation("ta") <-- does not raise event
END

' below works for read/write
PRIVATE SUB Position_write(Position AS Integer)
  txtPos.Text = Position  
  IF position = 4 THEN RAISE DoNavigation("pre") <-- this works not
END
PRIVATE FUNCTION Position_read() AS Integer
  RETURN txtPos.Text 
END
PRIVATE SUB Total_write(Total AS Integer)
  txtTotal.Text = Total  
END
PRIVATE FUNCTION Total_read() AS Integer
  RETURN txtTotal.Text 
END
----------------------------------

the main form

PRIVATE NavBar AS Fnavbar

STATIC PUBLIC FUNCTION Run() AS Boolean

  DIM hForm AS Form

  hForm = NEW Form1
  RETURN hForm.ShowModal()

END

PUBLIC SUB _new()
  NavBar = NEW Fnavbar AS "Browser"
END

PUBLIC SUB Browser_DoNavigation(sBtnTag AS String)
  TimerNavBtn = ""   
  DoNavigation(sBtnTag)
END

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I found an example on a german wiki and created that one.
http://de.wikibooks.org/wiki/Gambas:_Event
at the bottom the example.

The event works here but it is a class that raise the event.
I try it from a form class.

Where to look for wrong thing?