RAD Studio VCL Reference
TCustomAction.AutoCheck Property

Controls whether the Checked property toggles when the action executes.

property AutoCheck: Boolean;
__property Boolean AutoCheck;

AutoCheck causes the checked property to toggle when the action executes. This allows the action's Checked property to remain in sync with the client's Checked property (or equivalent). If the client is a menu item (where the Checked property does not necessarily toggle), AutoCheck is propagated to the AutoCheck property of the menu item. 

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