How to use custom enum values in indexed binding path

See more:

WPF

Hi All!

WPF is new to me, and I am stalled at a point.
I have an enum:

[Flags]
public enum Toners
{
        black = 1,
        cyan = 2,
        magenta = 4,
        yellow = 8
}

and a class, that has an indexer property based on this enum:

public string this[Toners toner]
{
  get
  {
    return this.TonerLevels.ContainsKey(toner) ? this.TonerLevels[toner].ToString() : String.Empty;
  }
}

Great, but I can't get any result when binding a textcolumn to it:

<DataGridTextColumn Header="Black" Binding="{Binding [Toners.blank]}" Width="100" CellStyle="{StaticResource CenterCellStyle}"/>

The same snippet is working when the index is of type int, and I am referencing it as {Binding [1]}

Please guide me, how to make it work in the enum way if possible.

[Update]
I have also tried importing the namespace containing the enum directly into the xaml, and referencing the enum value both with "." and ":" notation, but still no result.

The worst is, that there is no error message either :(, only empty result. I suppose it would brig me closer, if I could increase somehow the verbosity of the xaml compilation, but I have no idea how.

Thank you.