/// <summary>
 /// Returns the base image source string for the specified ID.
 /// </summary>
 /// <param name="id">
 /// The dropdown ID.
 /// </param>
 /// <returns>
 /// The base image source string.
 /// </returns>
 private static string GetBaseImageSource(DropdownID id)
 {
     return($"avares://OpenTracker/Assets/Images/Dropdowns/{id.ToString().ToLowerInvariant()}");
 }