labelWidget label; interactive widgets also use it for ID generation. A ## suffix can distinguish IDs without displaying the suffix.
vMutable widget value in element [0]; edits are written back into the supplied array. Pass Int32Array storage, not a JS scalar; native access uses the supplied backing memory.
v_buttonValue written to v[0] when this radio button is activated.
True when the item is activated this frame; this is an activation event, not a persistent selected state.
Display a radio button that updates an integer selection.