'Usage

Dim instance As ValidationOptionAttribute

'Declaration

<AttributeUsageAttribute(AttributeTargets.Property Or AttributeTargets.Event, AllowMultiple := False,  _
    Inherited := True)> _
Public NotInheritable Class ValidationOptionAttribute _
    Inherits Attribute

public sealed partial class Activity1: Activity
{
    public Activity1()
    {
    }

    public static DependencyProperty MyPropertyProperty = 
        DependencyProperty.Register(
            "MyProperty", 
            typeof(string), 
            typeof(Activity1),
            new PropertyMetadata(
                DependencyPropertyOptions.Metadata,
                new ValidationOptionAttribute(ValidationOption.Required)));

    [Browsable(true)]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
    public string MyProperty
    {
        get
        {
            return ((string)(base.GetValue(Activity1.MyPropertyProperty)));
        }
        set
        {
            base.SetValue(Activity1.MyPropertyProperty, value);
        }
    }
}