From Xojo Documentation(Redirected from Checkbox.Value)
As of 2009r1, the CheckBox is a tri-state control. Changing the VisualState property automatically changes the Value property. Changing the VisualState to Checked or Indeterminate automatically changes the Value to True if it isn't already. See the State property and the CheckedStates enum for more information. The Action event fires when the Value property is changed.