AtomCheckBoxList is inherited from AtomListBox, but by default it allows multiple selection and automatically provides comma separated values as value property. You can control layout property by giving it a table layout, which accepts number of columns, cell width and cell height parameters. In addition, you can also control your layout by overriding atom-check-box-list css styles.
If you want to use single check box item, then you must use AtomCheckBox control, which allows single boolean value check.