WPF

_mystore.BeginSaveChanges(SaveChangesOptions.None, (asyncResult) => { _mystore.EndSaveChanges(asyncResult); },null);

_mystore.SaveChanges();

_mystore.EndSaveChanges(asyncResult); }

<Window x:Class="WpfApplication2.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
    <Grid x:Name="grid" ShowGridLines="True">
        
    </Grid>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Threading;

namespace WpfApplication2
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();

            ObsCls coll = CreateObsColl();
            grid.DataContext = coll; //THIS IS WHAT I WANT, BUT IT DOES NOT WORK LIKE THIS
            

            for (int i = 0; i < 5; i++)
            {
                RowDefinition row = new RowDefinition();
                ColumnDefinition col = new ColumnDefinition();
                grid.RowDefinitions.Add(row);
                grid.ColumnDefinitions.Add(col);
            }

            foreach (var item in coll)
            {
                Grid.SetColumn(item, (int)item.Content);
                Grid.SetRow(item, (int)item.Content);
            }

            Thread t = new Thread(() =>
                {
                    Dispatcher.BeginInvoke(new Action(() =>
                        {
                            coll.Clear();
                            Button b = new Button() { Content = 4 };
                            Grid.SetRow(b, (int)b.Content);
                            Grid.SetColumn(b, (int)b.Content);
                            coll.Add(b);
                        }));
                });
            t.Start();
        }

        private ObsCls CreateObsColl()
        {
            ObsCls coll = new ObsCls();
            coll.Add(new Button() { Content = 1 });
            coll.Add(new Button() { Content = 2 });
            coll.Add(new Button() { Content = 3 });

            return coll;
        }
    }
}

using System.Collections.ObjectModel;
using System.Windows.Controls;

namespace WpfApplication2
{
    class ObsCls : ObservableCollection<Button>
    {
    }
}