You can use the C1Knob control's C1Gauge.Minimum, C1Gauge.Maximum, and C1Gauge.Value properties to specify the available range and the selected value in that range:

The C1Gauge.Minimum and C1Gauge.Maximum properties specify the range of values the knob is designed to show. The range is specified through the C1Gauge.Minimum and C1Gauge.Maximum properties (of type double). The default range for a C1Knob control is from 0 to 100.

The C1Gauge.Value property indicates the current value of the gauge. In the C1Knob control, this is indicated visually by the value the C1GaugePointer element is pointing to. The default C1Gauge.Value for a C1Knob control is 50.