C#

// Form1.cs
using System;
using System.Windows.Forms;
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        Click += new EventHandler(Form1_Click);
    }
    void Form1_Click(object sender, EventArgs e)
    {
        Form2 form2 = new Form2();
        form2.FloatEvent += new EventHandler<FloatEventArgs>(form2_FloatEvent);
        form2.Int32Property = 32;
        form2.SetStringValue("Hello World!");
        Console.WriteLine("Int: {0}, String: {1}", form2.Int32Property, form2.GetStringValue());
        form2.Show();
    }
    void form2_FloatEvent(object sender, FloatEventArgs e)
    {
        Console.WriteLine("Sender: {0}",sender);
        Console.WriteLine("Float: {0}", e.FloatValue);
    }
}

// Form2.cs
using System;
using System.Windows.Forms;
public partial class Form2 : Form
{
    public event EventHandler<FloatEventArgs> FloatEvent;
    private string _StringValue;
    public Form2()
    {
        InitializeComponent();
        Click += new EventHandler(Form2_Click);
    }
    void Form2_Click(object sender, EventArgs e)
    {
        OnFloatEvent(new FloatEventArgs(Int32Property));
    }
    public int Int32Property
    {
        get;
        set;
    }
    public void SetStringValue(string stringValue)
    {
        _StringValue = stringValue;
    }
    public string GetStringValue()
    {
        return _StringValue;
    }
    protected virtual void OnFloatEvent(FloatEventArgs e)
    {
        EventHandler<FloatEventArgs> eh = FloatEvent;
        if (eh != null)
            eh(this, e);
    }
}

// FloatEventArgs.cs
using System;
public class FloatEventArgs : EventArgs
{
    private float _FloatValue;
    public FloatEventArgs(float floatValue)
    {
        _FloatValue = floatValue;
    }
    public float FloatValue
    {
        get { return _FloatValue; }
    }
}

private void tabControl1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{

    TabControl tc = sender as TabControl;

    if (tc.SelectedIndex == 1 && selectedIndexTracker !=1)
    {
        selectedIndexTracker = 1;
        angleListBox.ScrollIntoView(15);
    }

}