Applies to

CheckBox, RibbonCheckBoxItem controls


The ThirdState property specifies whether the CheckBox is in the third state (neither selected nor unselected).

For a check box to be in the third state, the ThreeState property must also be enabled.


In a painter

To specify that a check box is in the third state:

  • Check both the ThreeState and the ThirdState check boxes on the General page of the control's Properties view.

In scripts

The ThirdState property takes a boolean value. The following lines specify that a CheckBox can have three states and that it starts out in the third state:

cbx_1.ThreeState = TRUE
cbx_1.ThirdState = TRUE