Add it to one of the header elements you have to add re-size to column. Max 1 per column
<v-grid-col col-width="120">
<v-header-template>
<p>Full name</p>
<input v-resize-col>
</v-header-template>
<v-row-template>
<input value.bind="rowRef.name">
</v-row-template>
</v-grid-col>
