For example, the following picture illustrates two layers - one is added to the CircularGauge and therefore occupies the entire Gauge control area, and the other is added to the ArcScale object.
Every new layer is painted behind all other gauge elements because its GaugeOptionsBase.ZIndex property is set to -100 by default. To bring this layer to the front of other gauge elements (or paint it above other layers, if there are any), set the ZIndex property to a greater value.
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