DesktopListbox Properties Combobox Empty

Feedback Case Number: 67836

maybe someone had the same issue and know why this happened.

Did you change the superclass ?

I made a long thread in December last year about such a conversion. You need to be careful doing it and proceed slowly.

Thread was: API1 to API2 conversion experience

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somehow yes because i converted all to desktopcontrols.
sometimes this combobox looks good sometimes empty and much longer.
i not saved the project. opened again and it appear normal!?
the project was saved in xml.