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Use a mixed checkbox, located on the System palette, to display a TRUE, FALSE, or MIXED value.

Although the mixed checkbox is an enumerated type control, you can configure the control similarly to a Boolean control.

To disable the MIXED value of a mixed checkbox, right-click the control and select Allow Mixed from the shortcut menu to remove the checkmark next to the menu item. When you disable Allow Mixed, LabVIEW can assign the value of the mixed checkbox as MIXED, but you cannot operate to MIXED by clicking on it.

You also can use the Allow Mixed property to disable the MIXED value of a mixed checkbox programmatically.

Refer to the labview\examples\general\controls\MixedCheckbox.vi for an example that demonstrates the mixed value of a mixed checkbox.