Creates a list whose multiple items can be selected. This element must be
used within CKForm or HTML form.
| escape: | Escapes HTML control characters in "value" if the
"escape" is true. The default value is true.
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| list: | Array which is iterated through. The first object
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| default: | The first item if no item is selected.
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| selected: | Items which are chosen from the list.
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| multiple: | Multiple items of the list can be selected if the value is true.
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| size: | Size of item in appearance.
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| disabled: | If the value is true, the element appears but is not active.
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