UIPermission
Controls the permissions related to user interfaces and the Clipboard. This class cannot be inherited.
                namespace System.Security.Permissions
{
    public sealed class UIPermission : CodeAccessPermission, IUnrestrictedPermission
    {
        public UIPermissionClipboard Clipboard { get; set; }
        public UIPermissionWindow Window { get; set; }
        public UIPermission(PermissionState state)
        {
        }
        public UIPermission(UIPermissionClipboard clipboardFlag)
        {
        }
        public UIPermission(UIPermissionWindow windowFlag)
        {
        }
        public UIPermission(UIPermissionWindow windowFlag, UIPermissionClipboard clipboardFlag)
        {
        }
        public override IPermission Copy()
        {
            return this;
        }
        public override void FromXml(SecurityElement esd)
        {
        }
        public override IPermission Intersect(IPermission target)
        {
            return null;
        }
        public override bool IsSubsetOf(IPermission target)
        {
            return false;
        }
        public bool IsUnrestricted()
        {
            return false;
        }
        public override SecurityElement ToXml()
        {
            return null;
        }
        public override IPermission Union(IPermission target)
        {
            return null;
        }
    }
}