You can easily access properties for any hit-testable Gauge for WinForms item at design time by double-clicking the item on your form and opening the Item Editor. You can also open the Item Editor by right-clicking an item and selecting Launch Item Editor from the context menu.

For example, double-click the C1GaugeCap on a C1RadialGauge.

The C1RadialGauge1.Cap Item Editor opens, allowing you to set the properties for the cap and to access collection editors.