How to refresh the tab content from a menu?

Hi there,
Ik have a dynamic menu that opens the links in a tab. in each tab their is the same calender showing a duty roster based on the employe. some duty’s are together so their on each calendar.

Now when i drag in one calendar, the other calenders (in the tabs) show the old appointment (that’s normal, no refresh) So i wan’t a refresh on the calender or on the tab each time the user clicks on the tab or on a build in button so the tab content refresehes. any suggestions?