private void newToolStripMenuItem_Click(object sender, EventArgs e)
 {
     _guiHandler = new GUIHandler();
     this.guiDisplay.GUIHandler = _guiHandler;
 }
        private void loadToolStripMenuItem_Click(object sender, EventArgs e)
        {
            var openFileDialog = new OpenFileDialog();
            openFileDialog.DefaultExt = ".xml";
            openFileDialog.Filter = "XML Files (*.xml)|*.xml";
            openFileDialog.RestoreDirectory = true;

            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                _guiHandler = new GUIHandler();

                _guiHandler.Load(openFileDialog.FileName, this.guiDisplay.Content);

                this.guiDisplay.GUIHandler = _guiHandler;
            }
        }