How to highlight block of xml background only

On Editor_Changed when there is no selection I collect the textrange of the current block of xml and change the background to a pale colour.

To accomplish this I use HighlightingStyleSpanIndicator but my problem is the nicely colored font of xml attributres are also changed.

//Control Init
editor.Document.SpanIndicatorLayers.Add(_spanIndicatorBlockHighlight);
_spanIndicatorBlockHighlightingStyle = new HighlightingStyle(_spanIndicatorBlockHighlightName, "res:Block Highlight Style", Color.Empty, SystemColors.Control);


// How can I only change the textrange background color without affecting forecolor?
void editor_SelectionChanged(object sender, SelectionEventArgs e)
{
    editor.Document.SpanIndicatorLayers[_spanIndicatorBlockHighlightName].Clear();

    if (e.Selection.IsZeroLength)
    {
        //highlight the block  
        editor.Document.SpanIndicatorLayers[_spanIndicatorBlockHighlightName].Add(
             new HighlightingStyleSpanIndicator("HSS", _spanIndicatorBlockHighlightingStyle), MyTextRange);
    }
}