How to passing data from Event to other form

public class IButtons : System.Windows.Forms.Button
{

    #region Private data memory

    private Guid _Id;
    private Product_data _iproduct;

    #endregion

    private Size defualt_Bsize = new Size(156, 68); //Defualt button size

    public Guid Button_id { get { return _Id; } set { _Id = value; } }

    public Product_data IProduct { get { return _iproduct; } set { _iproduct = value; } }

    public IButtons(Guid Id, Color Button_color, Size Button_size, Product_data Product)
    {
        //Set button Text property as the product name
        this.Text = Product.Name;

        //Button color
        Color color = Button_color;
        if (color == null || color.IsEmpty)
            this.BackColor = Color.FromName("Control");
        else
            this.BackColor = color;

        //Button size
        Size b_size = Button_size;
        if (b_size == null || b_size.IsEmpty)
            this.Size = defualt_Bsize;
        else
            this.Size = b_size;

        //Button Id
        if (Id == null || Id == Guid.Empty)
            _Id = Guid.NewGuid();
        else
            _Id = Id;

        _iproduct = Product; //Load product to private memory

        this.FlatStyle = System.Windows.Forms.FlatStyle.Flat; //Convert button style from standard to flat

        this.Click += new EventHandler(ClickOnButton_event); //Load click event to button
    }

    private void ClickOnButton_event(object sender, EventArgs e)
    {
        System.Windows.Forms.MessageBox.Show(string.Format("Produt Id {0} / Name {1} / Retail Price {2}", _iproduct.Id, _iproduct.Name, _iproduct.Price));
    }

    private void InitializeComponent()
    {
        this.SuspendLayout();
        this.ResumeLayout(false);
    }

}

System.Windows.Forms.MessageBox.Show(string.Format("Produt Id {0} / Name {1} / Retail Price {2}", _iproduct.Id, _iproduct.Name, _iproduct.Price));