public void DeleteReqired()
{
if (floor < Defaults.Floors - Defaults.Basements - 1)
{
upwards_requireds[Defaults.FloorToIdx(floor)] = false;
button_upward[Defaults.FloorToIdx(floor)].Enabled = true;
}
if (floor > (-Defaults.Basements))
{
downwards_requireds[Defaults.FloorToIdx(floor)] = false;
button_downward[Defaults.FloorToIdx(floor)].Enabled = true;
}
intern_requireds[Defaults.FloorToIdx(floor)] = false;
button_intern[Defaults.FloorToIdx(floor)].Enabled = true;
}