Please refer to the code below:
<button @click="$refs.tt.select(1)">select</button>
<Tabs ref="tt" style="height:250px">
<TabPanel :title="'Tab1'">
<p>Tab Panel1</p>
</TabPanel>
<TabPanel :title="'Tab2'">
<p>Tab Panel2</p>
</TabPanel>
<TabPanel :title="'Tab3'">
<p>Tab Panel3</p>
</TabPanel>
<TabPanel :title="'Help'" :closable="true" iconCls="icon-help">
<p>This is the help content.</p>
</TabPanel>
</Tabs>