I have a wired problem. I have a model and a ItemV...

# tornadofx

[nimakro]

I have a wired problem. I have a model and a ItemViewModel

java 
class Model() {
// -- Toolbar
    val expandLevelProperty = SimpleIntegerProperty()
    var expandLevel : Int by expandLevelProperty
}
class ViewModel : ItemViewModel<Model>() {
// Throws the exception!!
 val expandLevel : IntegerProperty = bind { item?.expandLevelProperty }
}

when I start my app I get an java.lang.ClassCastException: javafx.beans.property.SimpleObjectProperty cannot be cast to javafx.beans.property.IntegerProperty.
Is that a bug or em I am doing something wrong again?