manager= new MenuManager(id, id);
manager.setRemoveAllWhenShown(true);
manager.addMenuListener(getContextMenuListener());
Control rulerControl= fVerticalRuler.getControl();
fRulerContextMenu= manager.createContextMenu(rulerControl);
rulerControl.setMenu(fRulerContextMenu);
rulerControl.addMouseListener(getRulerMouseListener());
if (fRulerContextMenuId != null)
getEditorSite().registerContextMenu(fRulerContextMenuId, manager, getSelectionProvider(), false);