private void Form4_FormClosing(Object sender, FormClosingEventArgs e)
{
openFindForm = null;
}
private void Find()
{
Form4 newForm = new Form4();
openFindForm = newForm;
openFindForm.btnFind.Click += new System.EventHandler(this.PressedFind);
newForm.Show();
openFindForm.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.Form4_FormClosing);
}