Novi item u combo box-u ?

Code:
        private void button1_Click(object sender, EventArgs e)
        {
            Form2 form2 = new Form2();

            form2.comboBox1.Items.Add("Test");
            form2.comboBox1.SelectedIndex = 0;

            form2.ShowDialog();
        }

Code:
public partial class Form1 : Form
    {
        Form2 form2 = new Form2();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            form2.Show();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            form2.comboBox1.Items.Add("Test " + form2.comboBox1.Items.Count);
            form2.comboBox1.SelectedIndex = form2.comboBox1.Items.Count-1;
        }


    }