how do i programaticaly modify controls?

[semajh]

I am trying to add items to a listbox (either my one type def or the labview generic) by opening a reference to the control or to a LabVIEW VI with the control on its panel. I can ony get a refenence to a generic control class not to the specific listbox class.

[JeanPierre]

You have to convert the generic control refnum to a listbox control refnum using "To More Specific Class" function. Drop a "Class Specifier Constant" and select a listbox control to set the class.