Here is an example :

[C#]

public class MyStateControl : ButtonBase

{

public MyStateControl() : base() { }

public Boolean State

{

get { return (Boolean)this.GetValue(StateProperty); }

set { this.SetValue(StateProperty, value); }

}

public static readonly DependencyProperty StateProperty = DependencyProperty.Register(

"State", typeof(Boolean), typeof(MyStateControl),new PropertyMetadata(false));

}