The Control class is the base class for many of the controls you add to an application. The Control class defines very little behavior; while it is possible to add a Control to your application, it is far more common to add a control that inherits from Control, such as a Button or ListBox.
The Template property, which is a ControlTemplate, specifies the appearance of the Control. If you want to change the appearance of a control but retain its functionality, you should consider creating a new ControlTemplate instead of creating a new class. For more information, see Styling and Templating.
If you want to create a control with custom behavior as well as allow others to customize its appearance, your control can inherit from the Control class and define a ControlTemplate. If you want to extend the behavior of an existing control, you can inherit from a class that inherits from Control.
A Control that does not have a ControlTemplate is not visible in your application, and setting the following properties has no effect unless the ControlTemplate references them explicitly:
A common way to use these properties is to bind an element in the ControlTemplate to the property. For example, if you want your control to change color according to the value of the Background property, you can bind some property of an element in the ControlTemplate to the Background. Use the TemplateBinding Markup Extension to bind properties on a control to an element in the ControlTemplate.
Control overrides the metadata of the Focusable property and sets its default to true. For more information, see Dependency Properties Overview