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Defines possible check mark styles for RadioButtonField and CheckBoxField.
Check: 0;
The check mark looks like a check.
Circle: 1;
The check mark looks like a circle.
Cross: 2;
The check mark looks like a cross.
Diamond: 3;
The check mark looks like a diamond.
Square: 4;
The check mark looks like a square.
Star: 5;
The check mark looks like a star.