Hello,

There is an event called AfterContentControlLoad (in Umbraco.controls.ContentControl) and I've once been able to hide the complete menu. Here is the code I used:

public void ContentControl_AfterContentControlLoad(ContentControl contentControl, ContentControlLoadEventArgs e)
{
    //Get the id of the document.
    int id = Convert.ToInt32(HttpContext.Current.Request.QueryString["id"]);

    //Get the document.
    Document document = new Document(id);

    //Get the userId of the current user.
    int userId = UmbracoEnsuredPage.GetUserId(UmbracoEnsuredPage.umbracoUserContextID);

    //Check if the current user is the creator of the document. If he's not the menu will be disabled and the user can't save the data.
    //If the userId is 0 the user is the admin and this code must be skipped because the admin must be able to edit everything.
    if ((document.Creator.Id != userId) && (userId != 0))
    {
        foreach (Control control in contentControl.Controls)
        {
            //Search all the TabPage controls in the contentControl.
            if (control is TabPage)
            {
                //Hide the menu.
                ((TabPage)control).Menu.Attributes["style"] = "Display: none;";
            }
        }
    }
}

Maybe you can use something like to this to hide those arrows.

Jeroen