def METHOD_NAME(self):
    '''show a file dialog'''
    from MAVProxy.modules.lib.wx_loader import wx
    dlg = linkAddDialog(None, title='Add New Link')
    if dlg.ShowModal() != wx.ID_ADD:
        return None
    else:
        # get the connection string before closing dialog
        Constr = dlg.conStr
        dlg.Destroy()
        return Constr