property CalendarCombo.CheckImage(State as CheckStateEnum) as Long
Retrieves or sets a value that indicates the image being displayed as a checkbox.

State as CheckStateEnum A CheckStateEnum expression that specifies the state of the checkbox whose image is changed
Long A Long expression that indicates the index of the icon being displayed, in the specified state.
Use the CheckImage property to change the visual appearance for the control's check box. The ImageSize property defines the size (width/height) of the check-box field. Use the AllowCheckBox property to display a checkbox left to the control's label. Use the Images method to assign a list of icons to the control.