private void addBuildingType(object sender, RoutedEventArgs e)
        {
            var bType = new BuildingType();
            AddEditBuildingTypeWindow addEditBuildingTypeWindow = new AddEditBuildingTypeWindow(bType);
            var result = addEditBuildingTypeWindow.ShowDialog();

            if (result == true)
            {
                context.BuildingTypes.Add(bType);
                buildingTypes.Add(bType);
                context.Save();
                addEditBuildingTypeWindow.Close();
            }
        }
        private void btnEdit_Click(object sender, RoutedEventArgs e)
        {
            var bType = viewBuildingTypeDataGrid.SelectedItem as BuildingType;

            if (bType != null)
            {
                AddEditBuildingTypeWindow addEditBuildingTypeWindow = new AddEditBuildingTypeWindow(bType);
                var result = addEditBuildingTypeWindow.ShowDialog();
                if (result == true)
                {
                    this.DialogResult = true;
                    context.Save();
                    addEditBuildingTypeWindow.Close();
                }
                else
                {
                    viewBuildingTypeDataGrid.DataContext = null;
                    viewBuildingTypeDataGrid.DataContext = buildingTypes;
                }
            }
        }