Member variable Xbp3State():autoSize Foundation
Automatically fit the size of the three state button to the caption.
The default value of :autoSize is .F. (false). This means that a three state button is displayed in the size specified in the parameter <aSize> when the button is created. If :autoSize is set to .T. (true), the three state button is automatically resized to fit the caption. If this instance variable is set to .T., the <aSize>parameter of the :create() method cannot be specified, or must be specified as the array {0,0}.
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