[Closed] Unknown property: "children" in System.Windows.Controls.StackPanel

Hello guys

I have a weird issue with a stackpanel used in maxscript :

Unknown property: "children" in dotNetObject:System.Windows.Controls.StackPanel

Problem, it’s completely random and the script works fine most of the time (since children is a property of a stackpanel)…

The error happen from this kind of code:

global ui
struct uiStc
(
    _theButton,

    fn GetUI = 
    (
        _panel = dotNetObject "System.Windows.Controls.StackPanel"
        _panel.Children.Add(_theButton = dotNetObject "System.Windows.Controls.Button")

        _panel
    )
)
ui = uiStc()
ui.GetUI()

Any idea what’s going on and how to avoid this kind of issue ?