@adambl4 As in, inside the Anko code? Also, what I did to solve it, which I am not sure is good, I created a Property/field var ui = { } and I am creating a UI in that variable. Then when Async ends, the updateCategrySpinner is called

private fun updateCategorySpinner(result: RealmResults<Category>?) {
        var categorySpinner = ui.view.find<Spinner>(R.id.spinner_todo_category)
        var arrayAdapter:ArrayAdapter<Category> = ArrayAdapter(ctx,categorySpinner.id,result?.toMutableList())
//        arrayAdapter.setDropDownViewResource(categorySpinner.id)
        arrayAdapter.notifyDataSetChanged()
        categorySpinner.adapter = arrayAdapter
    }