/// <summary>
        /// Sets the picture box's Image in a thread-safe way. Makes the picture box visible and hides the video box.
        /// </summary>
        /// <param name="visible">Whether the picture box is visible</param>
        public void setPictureBoxPicture(Image theImage)
        {
            if (pictureBox.InvokeRequired) //wrong thread
            {
                setPictureBoxPictureCallback d = new setPictureBoxPictureCallback(setPictureBoxPicture);
                pictureBox.Invoke(d, new object[] { theImage });
            }
            else //right thread
            {
                //stop any movie playing if there is one
                sendPlaybackEvent("stop");

                //disable fullscreen if the player was fullscreen
                setVideoFullscreen(false);

                //restore the application if it was minimised to the system tray
                if (systemTrayIcon.Visible)
                {
                    systemTrayIcon_DoubleClick(this, null);
                }

                //hide the video player
                if (usingQuicktime)
                {
                    setQuicktimePlayerVisibility(false);
                }
                else
                {
                    setPlayerVisibility(false);
                }

                //enable the image toolbar item
                imageToolStripMenuItem.Enabled = true;

                //show the picture box and set its image
                setPictureBoxVisibility(true);
                pictureBox.Image = theImage;
            }
        }
        /// <summary>
        /// Sets the picture box's Image in a thread-safe way. Makes the picture box visible and hides the video box.
        /// </summary>
        /// <param name="visible">Whether the picture box is visible</param>
        public void setPictureBoxPicture(Image theImage)
        {
            if (pictureBox.InvokeRequired) //wrong thread
            {
                setPictureBoxPictureCallback d = new setPictureBoxPictureCallback(setPictureBoxPicture);
                pictureBox.Invoke(d, new object[] { theImage });
            }
            else //right thread
            {
                //stop any movie playing if there is one
                sendPlaybackEvent("stop");

                //disable fullscreen if the player was fullscreen
                setVideoFullscreen(false);

                //restore the application if it was minimised to the system tray
                if (systemTrayIcon.Visible)
                {
                    systemTrayIcon_DoubleClick(this, null);
                }

                //hide the video player
                if (usingQuicktime)
                {
                    setQuicktimePlayerVisibility(false);
                }
                else
                {
                    setPlayerVisibility(false);
                }

                //enable the image toolbar item
                imageToolStripMenuItem.Enabled = true;

                //show the picture box and set its image
                setPictureBoxVisibility(true);
                pictureBox.Image = theImage;
            }
        }