The pan control is not available for the selected camera
This VB example uses the minimum and maximum pan values to initialize the slider control:
Private SubForm_Load() Slider1.Min = ActiveDcam1.GetPanMin
Slider1.Max = ActiveDcam1.GetPanMax
Slider1.Value = ActiveDcam1.Pan
If the currently selected camera doesn't support software pan control, the method will generate an error.