ToolTip
Logically, a tooltip is floating content that appears when you hover over an associated element and disappears when you move the pointer away. (Unlike a Flyout, it is meant for hovering only and is noninteractive.) The ToolTip control doesn’t perform any of this magic, however. It’s a simple content control that places its content in a white box with a grey border (in the dark theme). The magic is done by a ToolTipService class and its three attached properties. The main one is ToolTipService.ToolTip, which enables a ToolTip to be attached to any UIElement and automatically appear/disappear when appropriate. Figure 9.13 shows a typical ToolTip in action, created from the following XAML:
<Button> + < ToolTipService.ToolTip > ...
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