C#, Silverlight/Telerik: RadMultiSelectDropDownColumn

RadMultiSelectDropDownColumn.cs

using System.Windows;
using GalaSoft.MvvmLight.Messaging;
using Telerik.Windows.Controls;
using Telerik.Windows.Controls.GridView;

namespace Fox.Xavier.Client.Views
{
    using Fox.Silverlight.Controls;
    using Fox.Silverlight.Models;

    /// <summary>
    /// Custom column wrapping a custom control.
    /// </summary>
    /// <remarks>
    /// <c>GridViewBoundColumnBase</c> provides overrides
    /// that fire consistently in the GridView.
    /// 
    /// Wrapping a custom control in, say, the <c>DataTemplate</c>
    /// of an unbound/bound column will not provide the same consistency.
    /// </remarks>
    public class RadMultiSelectDropDownColumn : GridViewBoundColumnBase
    {

        public override bool CanEdit(object item)
        {
            return false;
        }

        public override FrameworkElement CreateCellElement(GridViewCell cell, object dataItem)
        {
            var dropdown = new MultiSelectDropDown
            {
                DisplayMemberPath = "DisplayText",
                DropDownSummaryFormat = "{0} dpts selected",
                SelectedValuePath = "Id"
            };

            var content = new LightContentForFrameworkElement<MultiSelectDropDown>
            {
                Element = dropdown,
                DataOfContext = dataItem
            };
            var message = new LightMessage<LightContentForFrameworkElement<MultiSelectDropDown>>(content)
            {
                Source = LightMessageSource.ViewAddedChildren,
                UniqueId = this.UniqueName
            };
            Messenger.Default.Send(message);

            return dropdown;
        }
    }
}