void MkEqStmt(string l, string r)
{
var couple = new Tuple <Microsoft.Msagl.Drawing.Label, GraphAttr>(new Microsoft.Msagl.Drawing.Label(), this.graph.Attr);
var avPair = AttributeValuePair.CreateFromsStrings(l, r);
AttributeValuePair.AddAttributeValuePair(couple, avPair);
}
AttributeValuePair MkAvPair(string src, string dst)
{
return(AttributeValuePair.CreateFromsStrings(src, dst));
}