CheckBox
CheckBoxes are square boxes used to set independent options.
When they are selected, they contain a check mark; when they are not
selected, they are empty.
CheckBoxes are independent of each other. You can group them in
a GroupBox or rectangle to make the window easier to understand and
use, but that does not affect the CheckBoxes’ behavior; they are still
independent.
Using three states
CheckBoxes usually have two states: on and off. But sometimes
you need to represent a third state, such as Unknown. The third state
displays as a grayed box with a check mark.
To enable the third state
-
Select the ThreeState property in the General page of the
CheckBox Properties view.
To specify that a CheckBox’s current state is the third
state
-
Select the ThreeState and the ThirdState properties in the
General page of the CheckBox Properties view.