No have especific dependecy Property for customvalidator

Event:  CustomValidate(object sender, DependencyPropertyChangedEventArgs e)

How to get value to validation ?
CustomValidator cusvld = (sender as CustomValidator);
string value = (cusvld.ElementValidator as [Type of Control]).[Name property];

How to set result in event CustomValidate ?
CustomValidator cusvld = (sender as CustomValidator);
cusvld.SetValue(CustomValidator.ExternalResultProperty,[true or False]);