RAD Studio
Allowing Toggled Tool Buttons

Use AllowAllUp to create a grouped tool button that acts as a toggle: click it once, it is down; click it again, it pops up. To make a grouped tool button a toggle, set its AllowAllUp property to True

As with speed buttons, setting AllowAllUp to True for any tool button in a group automatically sets the same property value for all buttons in the group.

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