problem with checkbox in tapestry 4

[joe schacher]

when i assign a value to a checkbox, the value always passes as 'on'.

i've even tried simple code like this:

in jwc:

<component id="cnselect" type="Checkbox">

in html:

<span id="ognl:cn.id" jwcid="cnselect" value="1" onclick=alert(this.value)>

but the value returns as "on".  i also tried assigning displayName and
returning it, it always returns as "undefined".

any ideas?