PerformClick not working for second time

Question

I have a dialog with a button.

Somewhere in another page, I am launching the dialog and registering Load event and firing the button click using button.PerformClick

This works fine when I create instance of dialog every time where i am planning to call. but if I reuse the dialog, second time onwards the button click event is not firing

public partial class dlg : Form

{  // button1 is public

public dlg() { InitializeComponent(); }

private void button1_Click(object sender, EventArgs e) { MessageBox.Show("XXX"); }

}

-------------

dlg d = new dlg();   // option 1

void Test()

{

// dlg d = new dlg();  // option 2

d.Load += new EventHandler(delegate(object a, EventArgs ty) { d.button1.PerformClick(); });

d.ShowDialog();

}

If I enable option 2, I would get message "XXX" each time i call the Test method. If I enable option 1, first time it popups the message and not for the consequent times.