Problem with Static List type

Hello, Me again... I have a problem with the Static List type. In my class, I added a property of this type and as separators I tried everything from , to space. Then in Values I put 4 values separated by the chosen separator. The problem is that instead of 4 checkboxes, each in front of a different value, I get 1 checkbox and all the values together separated by the separator after it. What I do wrong? Thanks in advance. Evelina Slatineanu