private void button4_Click(object sender, EventArgs e)
        {
            bool flag = false;
            if (tbIme.Text == "")
            {
                MessageBox.Show("Vnesete Ime!");
                return;
            }
            if (cmbLevel.SelectedIndex == -1)
            {
                MessageBox.Show("Izberete level!");
                return;
            }
            foreach (Player p in players)
            {
                if (p.Nickname == tbIme.Text)
                {
                    flag = true;
                    p.Poeni = 0;
                }
            }
            if (flag == false)
            {
                Player p = new Player(tbIme.Text, 0);
                players.Add(p);
            }

            //this.Hide();
            if (cmbLevel.SelectedIndex == 0)
            {
                Program.Poeni = 0;
                Igra igra = new Igra();
                if (igra.ShowDialog() == DialogResult.Cancel)
                {

                }
            }

            if (cmbLevel.SelectedIndex == 1)
            {
                Program.Poeni = 0;
                Igraa1 igra1 = new Igraa1();
                if (igra1.ShowDialog() == DialogResult.Cancel)
                {

                }
            }

            if (cmbLevel.SelectedIndex == 2)
            {
                Program.Poeni = 0;
                Igra2 igra2 = new Igra2();
                if (igra2.ShowDialog() == DialogResult.Cancel)
                {

                }
            }
            for (int i = 0; i < players.Count; i++)
            {
                if (players[i].Nickname == tbIme.Text)
                {
                    players[i].Poeni = Program.Poeni;
                }
            }
        }