Use a mixed checkbox to display a TRUE, FALSE, or MIXED value. Complete the following steps to create and configure a mixed checkbox.
Add a mixed checkbox to the front panel window.
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Right-click the control and select Properties from the shortcut menu to display the Mixed Checkbox Properties dialog box. On the Appearance page, you can configure the enabled state; strings that LabVIEW displays when the value of the control is on, off, or mixed; and so on.
Right-click the control and select Allow Mixed from the shortcut menu to disable the ability to set the MIXED value of a mixed checkbox interactively. When you remove the checkmark from the Allow Mixed shortcut menu item, 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 System Mixed Checkbox VI in the labview\examples\Controls and Indicators\Boolean directory for an example that demonstrates the MIXED value of a mixed checkbox.
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