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This example is now obsolete. With XAF v16.2, the functionality demonstrated here is a part of the Feature Center demo: C:\Users\Public\Documents\DevExpress Demos 16.2\Components\eXpressApp Framework\FeatureCenter\CS. The complete description is still available in the How to: Customize Action Controls topic.
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See Also:
How to create custom action type with custom control (BarCheckItem), associated with it