<div class="grouped-select-wrapper">
    <div select-input model="group" choices="groups" disable="disable" empty-label="emptyLabel"></div>
    <div select-input model="model" choices="group.choices" disable="disable || !group.choices.length"></div>
</div>

<div class="grouped-select-wrapper">
    <div class="primary" select-input model="group" choices="groups" disable="disable" empty-label="emptyLabel"></div>
    <div class="secondary" select-input model="model" choices="group.choices" disable="disable || !group.choices.length"></div>
</div>

Add classes to differentiate styles of grouped selects
Add classes to differentiate styles of grouped selects
