“A label is considered to be a control because of its support for mnemonics (shortcut keys that transfer the focus to related controls). A tooltip is considered to be a control because it appears and disappears depending on the user’s mouse movements.” – Pro WPF in C# 2010 Windows Presentation Foundation in .NET 4, Matthew MacDonald.
For example, a Label can allow a user to access a menu by typing the “menu mnemonic“.
