How can I bind Pushpin location in WPF using MVVM? -

i'm developing desktop application uses bing maps , mvvm.

in application, user adds pushpin in map double clicking on it, pushpin location gets saved in event class , event class sent through wcf service.

i latitude , longitude pushpin using data binding, compiler complains dependencyproperty when try that. managed set latitude , longitude in viewmodel view, don't know if it's valid in mvvm. have seen examples using mapsitemcontrols don't understand them.

viewmodel

private event evt; public event evt {         {         return this.evt;     }     set     {         this.evt = value;         onpropertychanged("event");     } } 

map xaml

<m:map grid.rowspan="5" grid.column="3" margin="3"         name="operatormap"        credentialsprovider="map_key"         center="19.4000,-99.1333"         zoomlevel="5"         mousedoubleclick="setpushpinlocation" /> 

codebehind

private maintenanceformviewmodel viewmodel = new maintenanceformviewmodel(); private pushpin pin = null;  public mainwindow() {     initializecomponent();     this.loaded += (s, e) =>     {         this.datacontext = this.viewmodel;     }; }  private void setpushpinlocation(object sender, mousebuttoneventargs e) {     e.handled = true;     point mouseposition = e.getposition((uielement)sender);     location pinlocation = operatormap.viewportpointtolocation(mouseposition);     if (pin == null)     {         pin = new pushpin();         operatormap.children.add(pin);     }     pin.location = pinlocation;     this.viewmodel.evt.latitude = pinlocation.latitude;     this.viewmodel.evt.longitude = pinlocation.longitude; } 

bing maps uses attached property maplayer.position positioning elements on map.

given view model property of type location

public class viewmodel : inotifypropertychanged {     private location location;     public location location     {         { return location; }         set         {             location = value;             onpropertychanged("location");         }     }      ... } 

you can bind position of pushpin this:

<bm:pushpin bm:maplayer.position="{binding location}"/> 

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note in windows store app version of bing maps sdk there seems a bug when try setup binding in xaml. says (still bing maps sdk version 1.313.825.0)

failed assign property 'bing.maps.maplayer.position'

you can create binding in code behind:

pushpin.setbinding(maplayer.positionproperty,     new binding { path = new propertypath("location") });