private void pictureBox_startDemo_Click(object sender, EventArgs e)
{
FormDemoVisual mFormDemo = new FormDemoVisual();
mFormDemo.Show();
}
private void pictureBox_demo_back_Click(object sender, EventArgs e)
{
FormDemoVisual mFormDemoVisual = new FormDemoVisual();
mFormDemoVisual.Show();
this.Dispose();
}