Cfchart and JSON string representation

I am trying to pass a JSON string representation for the attribute "plotarea" in this way :
<cfchart
chartWidth="800"
chartHeight="600"
showLegend="yes"
format="png"
title="Commandes"
plotarea='#{"margin-top":"dynamic"}#' >
But I got following error :
Error casting an object of type to an incompatible type. This usually indicates a programming error in Java, although it could also mean you have tried to use a foreign object in a different way than it was designed.
Is there any documentation explaining how to use "JSON string representation" in cfchart attributes ?

Code_Worm wrote:
Is it possible for me to call my toString method of Manager class within Branch class?Sure as long as it is public. There is no magic or any difference in regards to the toString method to any other method that you create. So somewhere in your Branch class you have:
String blah = manager.toString();

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Cfchart and JSON string representation

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