public static DialogResult Show()
        {
            pauseForm = new PauseForm();

            pauseForm.ShowDialog();
            return(buttonResult);
        }
        public void GameScreen_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
        {
            //Opens a pause screen if escape is pressed.
            //Depending on what is pressed on pause screen the program will either continue or exit to main menu.
            if (e.KeyCode == Keys.Escape && gameTimer.Enabled)
            {
                gameTimer.Enabled = false;
                rightArrowDown    = leftArrowDown = false;

                DialogResult result = PauseForm.Show();

                if (result == DialogResult.Cancel)
                {
                    gameTimer.Enabled = true;
                }
                else if (result == DialogResult.Abort)
                {
                    MainForm.ChangeScreen(this, "MenuScreen");
                }
            }

            //player button presses
            switch (e.KeyCode)
            {
            case Keys.Left:
                leftArrowDown = true;
                break;

            case Keys.Right:
                rightArrowDown = true;
                break;
            }
        }