private void button14_Click(object sender, EventArgs e)
 {
     if (pause == false)
     {
         pause = true;
         world.SetPause(true);
         (sender as Button).Text = "PAUSE";
     }
     else
     {
         pause = false;
         world.SetPause(false);
         (sender as Button).Text = "PLAY";
     }
 }