Wemail.Common/RegionAdapters/StackPanelRegionAdapter.cs

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using Prism.Regions;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;

namespace Wemail.Common.RegionAdapters
{
    /// <summary>
    /// custom region adapter.
    /// </summary>
    public class StackPanelRegionAdapter : RegionAdapterBase<StackPanel>
    {
        public StackPanelRegionAdapter(IRegionBehaviorFactory regionBehaviorFactory) : base(regionBehaviorFactory)
        {
        }

        protected override void Adapt(IRegion region, StackPanel regionTarget)
        {
            region.Views.CollectionChanged += (sender, e) =>
            {
                if (e.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Add)
                {
                    regionTarget.Children.Clear();
                    foreach (var item in e.NewItems)
                    {
                        regionTarget.Children.Add(item as UIElement);
                    }
                }
            };
        }

        protected override IRegion CreateRegion()
        {
            return new Region();
        }
    }
}