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MxGraph - Add background to edge label

Martinez

I'm trying to add background to the edges label but it doesn't seem to be working. any suggestions?

here's my code:

graph.insertEdge(
  parent,
  r.id,
  r.name,
  src,
  target,
  'edgeStyle=orthogonalEdgeStyle;fontSize=14;fontColor=#000;fillColor=#fff;strokeColor=black'
);

this is what I am trying to achieve:

the current result: