In listbox, if we want to use shadow elements as parallel way as follow, it will get error.
<listbox model="@load(vm.model)">
<template name="model">
<if test="@load(true)">
<listitem>
<listcell>
<button label="@load(each.text)"/>
</listcell>
</listitem>
</if>
<if test="@load(false)">
<listitem>
<listcell>
<button label="@load(each.text)"/>
</listcell>
</listitem>
</if>
</template>
</listbox>