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Use <knowledge:articleTypeList> inside of an <apex:selectCheckboxes> tag?

I'm trying to create a list of article types with checkboxes to use as a filter on a custom knowledge base search page. For some reason I am unable to get the article types to appear as selectOptions inside of a selectCheckboxes tag. If I just output the article types as text, they work fine. Does anyone know if this is a VF limitation? My code:


<apex:selectCheckboxes value="{!articleTypeList}">
<apex:selectOption itemValue="all" itemLabel="All"/>
<knowledge:articleTypeList articleTypeVar="articleType">
<apex:selectOption itemValue="{!articleType.name}" itemLabel="{!articleType.label}"/>