private void button1_Click(object sender, EventArgs e)
{
About frm = new About();
frm.MdiParent = this.ParentForm;
this.Close();
frm.Show();
}
private void metroTileItem3_Click(object sender, EventArgs e)
{
About frm = new About();
frm.MdiParent = this.ParentForm;
this.Close();
frm.Show();
}