6.1. The Control Class
WPF windows are filled with elements, but only some of these elements are controls.
In the world of WPF, a control is generally described as a user-interactive element—that is, an element that can receive focus and accept input from the keyboard or mouse. Obvious examples include text boxes and buttons. However, the distinction is sometimes a bit blurry. A tooltip is considered to be a control because it appears and disappears depending on the user's mouse movements. A label is considered to be a control because of its support for mnemonics (shortcut keys that transfer the focus to related controls).
All controls derive from the System.Windows.Control class, which adds a bit of basic infrastructure:
The ability to set ...
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