How to cause a control follow its datasource?

class MyClass
    {
    public string Str { get; set; }
    public int I { get; set; }
    }
BindingList<MyClass> myBindingList = new BindingList<MyClass>();
private void button1_Click(object sender, EventArgs e)
    {
    myBindingList.Add(new MyClass() { Str = "s1", I = 100 });
    myBindingList.Add(new MyClass() { Str = "s2", I = 101 });
    myBindingList.Add(new MyClass() { Str = "s3", I = 102 });
    myBindingList.Add(new MyClass() { Str = "s4", I = 103 });
    myBindingList.Add(new MyClass() { Str = "s5", I = 104 });
    MyDataGridView.DataSource = myBindingList;
    }
private void button2_Click(object sender, EventArgs e)
    {
    myBindingList.Add(new MyClass() { Str = "sX", I = 666 });
    }