Date picker—Drilling up or down through days, months, years, and even decades.
AutoComplete control—Displaying multiple suggestions and grouping them; data binding with Knockout.js.
Tree view—Using check boxes to select multiple items; dragging items within the same tree, or to different trees.
Tab control—Closing entire tabs and nesting controls within tabs.
Accordion—Nesting accordions within accordions; expanding multiple sections at once.
Splitters—Expanding and collapsing split sections.
Check boxes—Making multiple selections.
Toolbar—Binding to remote and local data.
Dialogs—Opening multiple dialogs.