You'd need to add this to the proxy:

        /// <summary>
        /// Gets the output entry.
        /// </summary>
        /// <value>The output entry.</value>
        [System.ComponentModel.ReadOnlyAttribute(true)]
        [SRDisplayName("CreateEntryActivity_OutputEntry_Name")]
        [Browsable(false)]
        [AdvertiseBindingAttribute (true)]
        public EntryInformation82 OutputEntry
        {
            get
            {
                return null;
            }
        } 

and this to the activity code:

       /// <summary>
        /// Gets or sets the output entry.
        /// </summary>
        /// <value>The output entry value.</value>
        public EntryInformation82 OutputEntry
        {
            get { return (EntryInformation82)this.GetValue(OutputEntryProperty); }
            set { this.SetValue(OutputEntryProperty, value); }
        } 


        /// <summary>The output entry property.</summary>
        internal const string OutputEntryPropertyName = "OutputEntry";

        /// <summary>The output entry property.</summary>
        private static DependencyProperty OutputEntryProperty = DependencyProperty.Register(OutputEntryPropertyName, typeof(EntryInformation82), typeof(CreateEntryTaskActivity)); 

Then you need to set all its properties using this constructor:

 public EntryInformation82(string fullpath, int id, string repository, string server, Guid entryGuid) 

(where full path is parent path\entry name)