c# - How to show property descriptions in Windows Store App User Control? -

i use description attribute custom properties in wpf user control below.

        [category("features"), description("you can setup image width ratio in double type")]     public double imagewidthratio     {         { return (double)getvalue(imagewidthratioproperty); }         set { setvalue(imagewidthratioproperty, value); }     }      // using dependencyproperty backing store imagewidthratioproperty.  enables animation, styling, binding, etc...     public static readonly dependencyproperty imagewidthratioproperty =         dependencyproperty.register("imagewidthratio", typeof(double), typeof(thecontrol), new uipropertymetadata(1.0)); 

the line [category("features"), description("you can setup image width ratio")] gives descriptions groups in properties window.

but, windows store app user control. says no system.componentmodel.desriptionattribute.

how show property descriptions in properties window in winrt?

add helper class

using system;  namespace system.componentmodel {     [attributeusage(attributetargets.all)]     public class descriptionattribute : attribute     {         public descriptionattribute(string description)         {             description = description;         }          public string description { get; private set; }          public override bool equals(object obj)         {             if (obj == this)                 return true;              var other = obj descriptionattribute;             return other != null && other.description == description;         }          public override int gethashcode()         {             return description.gethashcode();         }     } }