Allowing toggle buttons

Sometimes you want to be able to click a button in a group that's already pressed and have it pop up, leaving no button in the group pressed. Such a button is called a toggle. Use AllowAllUp to create a grouped button that acts as a toggle: click it once, it's down; click it again, it pops up.

To make a grouped speed button a toggle, set its AllowAllUp property to True.

Setting AllowAllUp to True for any speed button in a group automatically sets the same property value for all buttons in the group. This enables the group to act as a normal group, with only one button pressed at a time, but also allows every button to be up at the same time.

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