Dashboard Demo - Autorefresh parent tab when child tab close

I am new to Vaadin, and already read several threads regarding this but still cannot understand. I managed to run successfully Dashboard Demo. I have a scenario when I clicked a link on tab (parent), another (child) tab will appear on the right side. What I want is when I close the child tab, parent tab will automatically refresh. May I know whether it can be done?

Thank you very much