private void editCustomer_ToolStripMenuItem_Click(object sender, EventArgs e) { menuStripMain.Enabled = false; editCustomer = new EditCustomer(); mainMessage.Text = "Διόρθωση Πελάτη Σε εξέλιξη...."; editCustomer.MdiParent = this; editCustomer.Show(); editCustomer.FormClosing += new FormClosingEventHandler(editCustomer_FormClosing); }