How to add a toolbar to a component?

Hello,

I would like to extend the table component with a toolbar for adding and removing columns and rows. As far as I understood the documentation and the code the function onActive should be triggered when a component is selected. Or did I misunderstood this function? Because when I try to extend the view of the table component like this

editor.DomComponents.addType("table", {
    view: {
         onActive() {
           ...
        },
        onDisable() {
             ...
        }
    }
}

the functions are no executed.

Best, Jens