Gmail predicts which emails might be of high importance to you so it marks them as important with a yellow icon. If your inbox ends up full of so called important emails, this is how you disable this feature.
Windows 8 has very functional calendar to remind you about all events you don't want to miss. In this lesson I will show you an example how to add birthday reminder.
You can visually insert a radio button into your form and set its properties. Use radio buttons when you want users to select only one choice from a set of options.