Please help me , I have a big problem

Question

Hello every body !!! . 
     Now , i develop silverlight application , which this  application contains two Usercontrols 
   the first one 
   add some information about certain shop and locate its location in the map to  store its location extents and its MapPoints from the map to Database 
  the second one 
  to retreive shop information and its location extents and mappoint from DB to locate these extents and MapPoint in the Map

but i have a big problem ???!!!! 😞

I'am working with MVVM in Silverlight 
Now i have a problem in the binding to Extents XMAx , YMax , Xmin , Ymin to get stored extents from DB to set these extents to  Map extents

<esriGeometry:Envelope XMin="{Binding ExtentXMin}" YMin="{Binding ExtentYMin}" XMax="{Binding ExtentXMax}" YMax="{Binding ExtentYMax}" />

its not working this operation

please help me to solve this problem 
thank you

JenniferNery · Answer

In XAML, you can then use your Envelope class that wrapped the API Envelope class instead.<local:MyEnvelope XMin="{Binding xmin}" .../>

RichardWatson · Answer

http://sharpgis.net/post/2009/05/03/Using-surrogate-binders-in-Silverlight.aspx

mohammadabdullah · Answer

thank you very much

but i have a question ,, this is about C# Side ,,, what about Xaml side ????
   what will i do in xaml to bind between this code and xaml