private void SaveFilePressed(GLUControl sender)
 {
     GLUFileBrowserDialog.ShowSaveDialog("Save file", "Folder", "File", "Ok", "Cancel", "", null, "*.*", "*.xml");
 }
 private void LoadFilePressed(GLUControl sender)
 {
     GLUFileBrowserDialog.ShowLoadDialog("Load file", "Folder", "File", "Ok", "Cancel", "", null, "*.*", "*.xml");
 }