public YesNoBehavior(MessageBoxBehavior behavior)
 {
     this.behavior = behavior;
 }
 public AbortRetryIgnoreBehavior(MessageBoxBehavior behavior)
 {
     this.behavior = behavior;
 }
 public OKBehavior(MessageBoxBehavior behavior)
 {
     this.behavior = behavior;
 }
 public RetryCancelBehavior(MessageBoxBehavior behavior)
 {
     this.behavior = behavior;
 }