private void button21_Click(object sender, EventArgs e) { using (OpenFileDialog dlg = new OpenFileDialog()) { dlg.Filter = "Smart Layout Document(*.gxd)|*.gxd"; if (dlg.ShowDialog() == System.Windows.Forms.DialogResult.OK) { IGxdDocument doc = GxdDocument.LoadFrom(dlg.FileName); _host.ApplyGxdDocument(doc); _host.Render(); } } }