private void OnOpen(object sender, EventArgs eventArgs)
{
SHELLEXECUTEINFO sei = new SHELLEXECUTEINFO();
sei.cbSize = Marshal.SizeOf(sei);
sei.fMask = SEE.SEE_MASK_IDLIST | SEE.SEE_MASK_CLASSNAME;
var fullPidl = PidlManager.IdListToPidl(PidlManager.Combine(_folderIdList, _folderItemIdLists[0]));
sei.lpIDList = fullPidl;
sei.lpClass = "folder";
sei.hwnd = CurrentInvokeCommandInfo.WindowHandle;
sei.nShow = CurrentInvokeCommandInfo.ShowCommand;
sei.lpVerb = "open"; // todo parameter open.
Shell32.ShellExecuteEx(ref sei);
PidlManager.DeletePidl(fullPidl);
}