//Part 1
Button btgetData=new Button(compositeLabels,SWT.PUSH);
        btgetData.setText("Get Data");
        btgetData.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                //raise event here
                Event event =new Event();
                event.detail=12345;
            getRoot().getShell().notifyListeners(MYEVENTCONST, event);
            }           
        });

//Part 2: 
//In each composite that hold TableViewer , listen event

getShell().addListener(MYEVENTCONST, new Listener() 
            public void handleEvent(Event event) {
      if(event.detail==12345)
              doProcessing();               
        });