[dokuwiki] Plugin form

Hi,

Is there a way of presenting a form with a dozen of options as check
marks and make sure that only 3 of them are used:

<FORM WHICH_SELECT>
Checkbox Sele01 "Do you want to use the xxx" 0;
Checkbox Sele02 "Do you want to use the xxx" 0;
Checkbox Sele03 "Do you want to use the xxx" 0;
Checkbox Sele04 "Do you want to use the xxx" 0;
Checkbox Sele05 "Do you want to use the xxx" 0;
Checkbox Sele06 "Do you want to use the xxx" 0;
Line;
Constraint Only3Selected
Buttons "proceed" "clear" 90;
</FORM>

How can I do the constraint: Only 3 items can be selected?

Thanks
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