private void button1_Click(object sender, EventArgs e)
        {
            TelaDisponivel telaDisponivel = new TelaDisponivel();

            this.telaAusente.Show();
            this.Hide();
        }
        private void PictureBox1_Click(object sender, EventArgs e)
        {
            TelaDisponivel telaDisponivel = new TelaDisponivel();

            telaDisponivel.Show();
            this.Show();
            this.Hide();
        }