/// <summary>
        /// handles the user right clicking and choosing "edit" on the staff grid.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void MenuItemEdit_Click(object sender, RoutedEventArgs e)
        {
            writeDebug("Editing staff member");

            //Get the MenuItem
            var menuItem = (MenuItem)sender;

            //Get the ContextMenu to which the menuItem belongs
            var contextMenu = (ContextMenu)menuItem.Parent;

            //Find the item that was right clicked.
            var item = (DataGrid)contextMenu.PlacementTarget;

            //get the cells (the row) that was selected.
            Staff staffToEdit = (Staff)item.SelectedCells[0].Item;

            //call a new employee popup with the staff member data.
            var newEmployeePopup = new NewEmployeePopup(this, staffToEdit);

            newEmployeePopup.Show();
        }
        /// <summary>
        /// The user clicks the "add employee" button
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void AddEmployeeBtn_Click(object sender, RoutedEventArgs e)
        {
            var newEmployeePopup = new NewEmployeePopup(this);

            newEmployeePopup.Show();
        }