public void f_settings_Activate()
{
P_calendar.BringToFront();
//Hidden button
P_settings.Hide();
P_research.Hide();
P_astronaute.Hide();
L_date.Hide();
}
public void f_settings_Deactivate()
{
P_calendar.BringToFront();
//Show button
P_settings.Show();
P_research.Show();
P_astronaute.Show();
L_date.Show();
}