//When the label is clicked, it shows The Engine Classification Panel
private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
Engine_Classification eclass = new Engine_Classification();
eclass.Show();
this.Hide();
eclass.previousform = this;
}
//When the picture is clicked, it shows The Engine Classification Panel
private void pictureBox4_Click(object sender, EventArgs e)
{
Engine_Classification eclass = new Engine_Classification();
eclass.Show();
this.Hide();
eclass.previousform = this;
}