protected override void OnHandleDestroyed(EventArgs e) { base.OnHandleDestroyed(e); if (this.DesignMode) { return; } if (_inkToolbar != null) { this.Controls.Remove(_inkToolbar); _inkToolbar.Dispose(); _inkToolbar = null; } if (_inkCanvas != null) { this.Controls.Remove(_inkCanvas); _inkCanvas.Dispose(); _inkCanvas = null; } }