Miva - Use Basket Custom Field to Preview Feature
<mvt:if expr="ISNULL g.new_feature">
<mvt:item name="customfields" param="Read_Basket('new_feature', g.new_feature)" />
</mvt:if>
<mvt:if expr="g.new_feature EQ '0'">
<mvt:item name="customfields" param="Write_Basket('new_feature', '')" />
<mvt:elseif expr="g.new_feature">
<mvt:item name="customfields" param="Write_Basket('new_feature', g.new_feature)" />
</mvt:if>