Defines a three-state check box control. The control is identical to a CHECKBOX, except that it has three states: checked, unchecked, and disabled (grayed).
STATE3 text, id, x, y, width, height [, style [, extended-style]]
Text that is to be displayed to the right of the control.
Control styles. This value can be a combination of the button class style BS_3STATE and the WS_TABSTOP and WS_GROUP styles.
If you do not specify a style, the default style is
BS_3STATE | WS_TABSTOP.
For more information about the general syntax of a control statement, see Common Control Parameters.