Attaching a signal to a GTK3 declared widget

So thanks to the help of Björn I am able to declare GTK3 controls from scratch. Adding signals – GTK events – to such a widget works too in the case of a button:

Private Sub AttachSignals()
  #If TargetLinux
    InstanceDict.Value(Mid) =  new WeakRef(Self)
    Dim c As cstring = "clicked"
    Call g_signal_connect_object(mid, c, AddressOf ActionHandler, nil, &h1ff)
  #EndIf
End Sub

When I try the same for a GTKSwitch, but now with a “state-set” tag and a modified Handler that returns a Boolean as in the docs, this method will never fire. Here is the shared method head I am referencing:

Private Shared Function StateSetHandler(button as ptr, state as boolean, Data as ptr) As Boolean

Any ideas what might be the fault? Tell me if you need a demo project to test. And thanks a lot!

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