public static void ShowClipboardEmptyDialog()
{
var primary = Catalog.GetString ("Image cannot be pasted");
var secondary = Catalog.GetString ("The clipboard does not contain an image.");
var markup = "<span weight=\"bold\" size=\"larger\">{0}</span>\n\n{1}\n";
markup = string.Format (markup, primary, secondary);
var md = new MessageDialog (Pinta.Core.PintaCore.Chrome.MainWindow, DialogFlags.Modal,
MessageType.Error, ButtonsType.None, true,
markup);
md.AddButton (Stock.Ok, ResponseType.Yes);
md.Run ();
md.Destroy ();
}