Extras includes the following controls: Activity Indicator, Animation, Button, Calculator, Drop Down Button, Formatted Link Label, Label, Popup Container, Progress Bar, Scroll Bar, Status Bar, Tooltip Manager, Validator

Always let your users know when a long running process is still occuring. 

Marquee-style continuous or bounce back animation that occupies users' attention during long-running processes such as installations.
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Make anything appear off of a dropdown.
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Use the Windows Forms popup container feature to provide more interactive options for users. 
View accompany descriptive text to the status bar and utilize the scrollbar to see more information. 

Show progress text on top of a progress bar.
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Scrollbars adjust to fit the window.
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Scrollbar Resizing 

Validate Windows Forms control values for correctness.
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Use the Windows Forms validation feature to verify data values entered in your applications.