constants CheckStateEnum
The CheckStateEnum type specifies the states of the element's check-box. The Checked property specifies the state of the element's check box. Use the ShowCheckBox property to show or hide the element's checkbox. The CheckStateEnum type supports the following values:

NameValueDescription
exUnchecked0 Specifies whether the element is unchecked. The Background(exCheckBoxState0) Specifies the visual appearance for the check box in 0 state.
exChecked1 Specifies whether the element is checked. The Background(exCheckBoxState1) Specifies the visual appearance for the check box in 1 state.
exPartialChecked2 (reserved) Specifies whether the element is partial-checked. The Background(exCheckBoxState2) Specifies the visual appearance for the check box in 2 state.