ASP.NET

internal class LabelSelectTypeEditor : UITypeEditor
{
    public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
    {
        return UITypeEditorEditStyle.DropDown;
    }

    public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
    {
        IWindowsFormsEditorService srv = null;
        if (provider != null)
            srv = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));

        if (srv != null)
        {
            System.Windows.Forms.ListBox lb = new System.Windows.Forms.ListBox();
            //foreach(Control c in Pa
            lb.Items.Add("test1");
            lb.Items.Add("test2");
            srv.DropDownControl(lb);
            return lb.Text;
        }

        return value;
    }
}