Buttons can be grouped with the <tc:buttons/>
tag.
Just add some <tc:button/>
tags.
Tag Library Documentation:
A simple example with three buttons.
<tc:buttons>
<tc:button label="Left"/>
<tc:button label="Center"/>
<tc:button label="Right"/>
</tc:buttons>
It is also possible to set a default button.
<tc:buttons>
<tc:button label="Left" defaultCommand="true"/>
<tc:button label="Center"/>
<tc:button label="Default"/>
</tc:buttons>
A dropdown button can also be placed in a <tc:buttons/>
tag.
<tc:buttons>
<tc:button label="Dropdown" omit="true">
<tc:link label="Action 1"/>
...
</tc:button>
<tc:button label="Center"/>
<tc:button label="Right"/>
</tc:buttons>