/// <summary>
    /// Przesuniêcie wybranego pojemnika do wybranej maszyny.
    /// </summary>
    /// <param name="sender">ignorowany, ale raczej bêdzie to przycisk przypisania</param>
    /// <param name="e">ignorowany</param>
    internal void AssignClick(object sender, EventArgs e)
    {
        if (_selectedMachineName == null || _selectedTubName == null)
        {
            return;
        }
        string fromMachineName = (string)NameBase.TubMachine()[_selectedTubName];

        NameBase.TubMachine()[_selectedTubName] = _selectedMachineName;
        UpdateTubList(fromMachineName);
        _gui.AssignButton().Enabled = false;
    }