SharePoint 2010 ships with the new Ribbon framework that allows you to easily extend the Ribbon with new functionality. All Ribbon extensions consist of the UI and behavior, which in simple scenarios can be specified declaratively but in more advanced scenarios would rely on a Page Component. Most samples, that show using Page Components, suggest registering them using Delegate Controls. Unfortunately this makes it impossible to use Page Component in Sandboxed Solutions which don’t support Delegate Controls. So are we forced to use the limited declarative approach or is there a solution that would allow us to register custom Page Components within Sandboxed Solutions?
Delivering a great User Experience for a custom application developed on the SharePoint application is really easy using the new SharePoint 2010 UI API. One of the new possibilities is to leverage the Notification Area to communicate the progress of an operation to the users to make using your applications more intuitive and responsive.
SharePoint 2010 ships with a brand new framework for delivering compelling user experiences for custom applications created using the SharePoint platform. One of the pieces of the UI framework is the Status bar which can be used to display persistent messages to the users.