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In WPF, what is the differences between CustomControls and UserControls? When should I use each?

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UserControl (Composition):

  • Composes multiple existing controls into a reusable "group"
  • Consists of a XAML and a code behind file
  • Cannot be styled/templated
  • Derives from UserControl

CustomControl (Extending an existing control)

  • Extends an existing control with additional features
  • Consists of a code file and a default style in Themes/Generic.xaml
  • Can be styled/templated
  • The best approach to build a control library

Source: The differences between CustomControls and UserControls

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