Visual C++ and MFC Programming 2nd Edition

Chapter 20: List-Based Controls Visual C++ and MFC Fundamentals

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19.2.2..Check Box Properties.........................................................................

To provide a check box to an application, on the Controls toolbox, click the Check Box

button and click the desired area on the dialog box or form. If you require more than

one check box, you can keep adding them as you judge necessary.

Like the radio button, a check box is a button with just a different style. Therefore, it

shares the same characteristics as the radio button. This means that we can simply avoid

repeating the descriptions we reviewed for the radio control.

Like the radio button, the accompanying label of the check box can appear on the left or

the right side of the square box. Also, you can control the horizontal and the vertical

alignments of its label using the Horizontal Alignment or the Vertical Alignment

properties.

We saw that a radio button can appear as a regular command button with 3-D borders.

This feature is also available for check boxes. When a check box with the Push-Like

property is up and then clicked, it stays down until it is clicked again, regardless of the

appearance of the other controls. Remember that a check box behaves independently of

the other controls even if it appears in a group.

A check box can be checked or unchecked. The check box as a control adds a third state

for its appearance. Instead of definitely appearing as checked or unchecked, a check box

can appear “half-checked”. This is considered as a third state. To apply this behavior to a

check box, set its Tri-State property to True or add the BS_3STATE style to it: