private void Btn_undo_Click(object sender, RoutedEventArgs e)
        {
            draftControls[draft.DraftingTeam.Name].Background = notDraftingColor;
            draft.RevertLastPick();
            draftControls[draft.DraftingTeam.Name].UnAssignPlayer(draft.Round);
            draftControls[draft.DraftingTeam.Name].Background = draftingColor;

            grd_players.ItemsSource = null;
            grd_players.ItemsSource = draft.DraftPool;

            UpdateHeader();
        }