Hello Amit,

I apologize that no one has yet repsonded to this post. In case you can still use the help you were looking for, I hope to answer all your questions.

I have attached a sample Silverlight project that loosely mimics the XAML you have attached. It utilizes a ViewModel, sample data generated by Expression Blend, and is written in Silverlight 4 and VB. It illustrates how to bind a ViewModel to a XAML UserControl.

1. Binding to the XamGrid is simple. Since you have data being returned from a WCF service, you need to copy the data to a collection that the XamGrid can be bound to. The convention I prefer is to create a ViewModel class. If you look at the attached sample, the ViewModel constructor gets the data. If you bind the ViewModel to the XAML you can display sample data for design mode and access your service when not in design mode.

Here is a sample of a shared property that returns if the application is in design mode (running in the Blend or Visual Studio Designer):

Public Shared Property InDesignMode() As Boolean
        Get
            If Application.Current Is Nothing Or
                 Application.Current.RootVisual Is Nothing Then
                Return True
            Else
                Return DesignerProperties.GetIsInDesignMode(
                                                       Application.Current.RootVisual)
            End If
        End Get 
        Private Set(ByVal value As Boolean) 
        End Set
    End Property

And here is the code for instantiating the ViewModel, Binding it to the DataContext of the layout and binding the collection in the ViewModel to the XamGrid:

<UserControl.Resources>
        <local:MainViewModel x:Key="ViewModel"/>
</UserControl.Resources>
    
<Grid x:Name="LayoutRoot" Background="White" 
    DataContext="{Binding Source={StaticResource ViewModel}}">

        <igGrid:XamGrid
            Name="dgTimeSheet"
            ItemsSource="{Binding TaskCollection}">

...