void OnProgressDisplayBarDestroyed(object o, DestroyEventArgs args)
{
ProgressDisplayBar pdb = (ProgressDisplayBar)o;
pdb.DestroyEvent -= OnProgressDisplayBarDestroyed;
this.Remove(pdb);
}
///<summary>
/// Get a callback for a new progress bar
///</summary>
public ProgressCallback NewCallback()
{
ProgressDisplayBar pdb = new ProgressDisplayBar();
this.PackStart(pdb);
pdb.DestroyEvent += OnProgressDisplayBarDestroyed;
return(pdb.Update);
}