<Label .../> defines a component that can be a text label for a control as well as providing mnemonic support.
The text that will be displayed by the label. This attribute can be omitted if the second declaration syntax is used.
Defines the target element of the Label. The target element must be of type UIElement and must exist in the XAML document. Assigning a Target to the Label keeps the label grouped with the element during the rendering process.