Mvvm Windows Phone 8 command Error: BindingExpression path error: 'SalvarCommand' -

my commands pointing model class , not modelview

system.windows.data error: bindingexpression path error: 'salvarcommand' property not found on 'superlistaw8.model.listaitem' 'superlistaw8.model.listaitem'

editlistapage.xaml

<phone:phoneapplicationpage x:class="superlistaw8.view.editlistapage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:phone="clr-namespace:microsoft.phone.controls;assembly=microsoft.phone" xmlns:shell="clr-namespace:microsoft.phone.shell;assembly=microsoft.phone" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:wm="clr-namespace:system.windows.controls;assembly=windowsphonewatermarktextboxcontrol" xmlns:i="clr-namespace:system.windows.interactivity;assembly=system.windows.interactivity" xmlns:cmd="clr-namespace:galasoft.mvvmlight.command;assembly=galasoft.mvvmlight.extras.wp8" fontfamily="{staticresource phonefontfamilynormal}" fontsize="{staticresource phonefontsizenormal}" foreground="{staticresource phoneforegroundbrush}" supportedorientations="portrait" orientation="portrait" datacontext="{binding source={staticresource locator}, path=listaviewmodel}"  mc:ignorable="d" shell:systemtray.isvisible="true"> 

editlistapage.xaml --> block text

<textbox grid.column="1" background="#f3f3f3" borderbrush="#f3f3f3" verticalalignment="top">                                         <i:interaction.triggers>                                             <i:eventtrigger eventname="textchanged">                                                 <cmd:eventtocommand command="{binding path=salvarcommand, mode=twoway}" passeventargstocommand="true"/>                                             </i:eventtrigger>                                         </i:interaction.triggers>                                     </textbox> 

viewmodellocator.cs

namespace superlistaw8.viewmodel { public class viewmodellocator {     public viewmodellocator()     {         servicelocator.setlocatorprovider(() => simpleioc.default);          if (!simpleioc.default.isregistered<idataservice>())         {             simpleioc.default.register<idataservice, dataservice>();             //simpleioc.default.register<inavigationservice>(() => new navigationservice());                     }          simpleioc.default.register<listaviewmodel>();     }      public listaviewmodel listaviewmodel     {                 {             return servicelocator.current.getinstance<listaviewmodel>();         }     }      public static void cleanup() { } } } 

listaviewmodel.cs

namespace superlistaw8.viewmodel {    public class listaviewmodel : viewmodelbase    {         public relaycommand salvarcommand { get; private set; }      public listaviewmodel(idataservice dataservice)     {         _dataservice = dataservice;          salvarcommand = new relaycommand(() =>         {             system.diagnostics.debugger.break();             });     }     }  } 

my commands being sought in model , not in viewmodel listaitem listaviewmodel. can me?

you name listbox , in binding reference elementname, , in path use datacontext.detailsvisibility

<listbox x:name="listbox" itemssource="{binding items}">     <listbox.itemtemplate>         <datatemplate>            <stackpanel orientation="horizontal">             <textblock text="{binding title}" />             <textblock text="{binding details}"                        visibility="{binding elementname=listbox,                                             path=datacontext.detailsvisibilty}" />         </stackpanel>     </datatemplate> </listbox.itemtemplate>