OlkCheckBox.TripleState Property (Outlook)
Returns or sets a Boolean that specifies whether a user can specify in the user interface the Null state for the control. Read/write.
Version Information
Version Added: Outlook 2007
Syntax
expression .TripleState
expression A variable that represents an OlkCheckBox object.
Remarks
If this property is True, the check box clicks through the three states. If this property is False, the check box supports only the True and False states. The default value is False.