void GetStartupClasses()
        {
            this.comboStartupObject.Items.Clear();
            this.comboStartupObject.Items.Add(DefaultValue);
            var prjfile = ParentPropertyPage.ProjectMgr.ProjectFile;
            var list    = XDatabase.GetStartupClasses(System.IO.Path.GetFileName(prjfile));

            foreach (var item in list)
            {
                this.comboStartupObject.Items.Add(item);
            }
            if (comboStartupObject.Items.Count == 1)
            {
                comboStartupObject.SelectedItem = DefaultValue;
                this.comboStartupObject.Items.Add("");
                comboStartupObject.Enabled = false;
            }
        }