It is very easy to do this but needs a bit of imagination and skill. Here is the code snippet that does it all.
private void button1_Click(object sender, EventArgs e)
{
if (minsys.Checked == true)
{
this.Visible = false;
}
this.WindowState = FormWindowState.Minimized;
}
This is the event handler of the minimize button.
Check the application and see how it works.