In the designer panel of Studio (the main area you work in), when you have the adapter open in interrogation mode (after clicking Start interrogation), you will see several tabs (Match Rules, Windows, Screenshot, etc...). Virtual Controls would be one of these assuming the application has them. It appears automatically when in Interrogation Mode for some applications.
var target = dijit.byId('uniqName_24_0'); target.loadDropDown();
To interrogate the control, we called this method and dragged the bulls-eye over the control and successfully interrogate and PerformClick()
For future controls, you should investigate this framework for functions available.