Awesome! Hey Arief, I'm not sure if you noticed, that when the list is loaded the first time you set focus in a textbox for quantity (based on your samples) the keyboard popups for a split second and the focus from the textbox is lost. In return you need to click the textbox again to bring the keyboard back up. Please confirm and advise how we can fix it... Thanks!

Okay, I think this may be related to the emulator.

using System;using System.Collections.Generic;
using System.Linq;
using Intersoft.AppFramework;
using Intersoft.AppFramework.Identity;
using Intersoft.AppFramework.Models;
using Intersoft.AppFramework.ViewModels;
using Intersoft.Crosslight;
using Intersoft.Crosslight.Input;
using Intersoft.Crosslight.RestClient;
using Mercury.Domain.Data;
using Mercury.Mobile.Core.Models.EventAggregators;
using Mercury.Mobile.Core.Models.QueryDefinitions;
using Mercury.Mobile.Core.Services;
using Mercury.Mobile.Common.Extensions;

namespace Mercury.Mobile.Core.ViewModels.Collection
{
    public sealed class LocationListViewModel
        : DataListViewModelBase<Location, ILocationRepository>
    {
        #region Field Variables

        private IQueryDefinition f_FilterQueryDefinition;
        private IQueryDefinition f_ViewQueryDefinition;

        private User f_User;

        #endregion

        #region Constructors

        public LocationListViewModel()
        {
            // Configure data behaviors.
            this.EnableRefresh = true;
            this.EnableAsyncFilter = true;
            this.ExitEditModeOnDelete = true;
            this.EnableIncrementalRefresh = true;

            // Enable incremental loading.
            this.EnableIncrementalLoading = true;
            this.IncrementalLoadingSize = 20;

            // Customize the service descriptor.
            this.ServiceDescriptor = new ServiceDescriptor();
            this.ServiceDescriptor.Parameters.Add("userName", this.User.UserName);
            this.ServiceDescriptor.ServiceName = "LocationsByUser";
            this.ServiceDescriptor.HttpMethod = HttpMethod.GET;

            // Commands.
            this.LoadIncrementalCommand = new DelegateCommand(this.ExecuteLoadIncremental, this.CanExecuteLoadIncremental);
            this.CancelCommand = new DelegateCommand(this.ExecuteCancel);
            this.DoneCommand = new DelegateCommand(this.ExecuteDone);
        }

        #endregion

        #region Commands

        public DelegateCommand LoadIncrementalCommand { get; set; }
        public DelegateCommand CancelCommand { get; set; }
        public DelegateCommand DoneCommand { get; set; }

        #endregion

        #region Properties

        /// <summary>
        /// Gets the filter query.
        /// </summary>
        /// <value>The filter query.</value>
        protected override IQueryDefinition FilterQuery
        {
            get 
            { 
                if (this.f_FilterQueryDefinition == null)
                    this.f_FilterQueryDefinition = new LocationQueryDefinition();

                return this.f_FilterQueryDefinition; 
            }
        }

        /// <summary>
        /// Gets the view query.
        /// </summary>
        /// <value>The view query.</value>
        protected override IQueryDefinition ViewQuery
        {
            get 
            { 
                if (this.f_ViewQueryDefinition == null)
                    this.f_ViewQueryDefinition = new LocationQueryDefinition();

                return this.f_ViewQueryDefinition; 
            }
        }

        /// <summary>
        /// Gets the user.
        /// </summary>
        /// <value>The user.</value>
        public User User 
        {
            get
            {
                if (this.f_User == null)
                    this.f_User = this.GetService<IUserService>().GetCurrentUser();

                return this.f_User;
            }
        }

        #endregion

        #region Methods

        private bool CanExecuteLoadIncremental(object paramater)
        {
            return this.EnableIncrementalLoading;
        }

        private void ExecuteLoadIncremental(object parameter)
        {
            this.LoadDataIncremental();
        }

        private void ExecuteCancel(object parameter)
        {
            this.NavigationService.Close(new NavigationResult(NavigationResultAction.Cancel));
        }

        private void ExecuteDone(object parameter)
        {
            this.NavigationService.Close(new NavigationResult(NavigationResultAction.Done));
        }

        #endregion

        #region Action Methods

        protected override void OnDataOperationFailed(Exception exception, DataAction action)
        {
            base.OnDataOperationFailed(exception, action);

            // This is only added to display the stacktrace on release.
            this.MessagePresenter.Show(exception.StackTrace);
        }

        #endregion
    }
}