Reproducible with the Grid's tag helper. Works as expected in the Html helper.
The toolbar does not show the RadioGroup.
A RadioGroup should appear in the toolbar, as set in the toolbar command template:
<toolbar-command-template>
<kendo-radiogroup name="test">
<kendo-radiogroup-items>
<kendo-radiogroup-item label="Factor" value="F"></kendo-radiogroup-item>
<kendo-radiogroup-item label="Equation" value="E"></kendo-radiogroup-item>
</kendo-radiogroup-items>
</kendo-radiogroup>
</toolbar-command-template>