How to populate selectManyCheckbox

How can I please populate the selectManyCheckbox component.

<h:form>

<h:selectManyCheckbox value="#{myBean.selectedItems}">

<f:selectItems value="#{myBean.selectItems}" />

</h:selectManyCheckbox>

<h:commandButton value="submit" action="#{myBean.action}" />

</h:form>

What are the types of each bean used property : myBean.selectedItems and myBean.selectItems .And what is the utility of each one .

Thanks

[595 byte] By [WebServicea] at [2007-11-27 5:46:42]