visibility of a chart

[Cyrille Piatecki]

I have a lot of chart of pie type  looking as

var chart23 = board.create('chart', dataArr23,
        {chartStyle:'pie',  
         colors:['#0F408D','#6F1B75','#CA147A','#DA2228','#E8801B','#FCF302','#8DC922','#15993C','#87CCEE','#0092CE'],
         fillOpacity:0.8, center:[5,2], strokeColor:'white', highlightStrokeColor:'black', strokeWidth:4,visible:false,
         labels:["$\\textrm{Intervention (33%)}$","$\\textrm{Dotation (0.14%)}$", "$\\textrm{Opérations Financières (20%)}$","$\\textrm{Fonctionnement (10%)}$", "$\\textrm{Charge de la Dette (7%)}$", "$\\textrm{Personnel (27%)}$","$\\textrm{Investissement (3%)}$"],
         highlightColors:['#E46F6A','#F9DF82','#F7FA7B','#B0D990','#69BF8E','#BDDDE4','#92C2DF','#637CB0','#AB91BC','#EB8EBF'],
         highlightOnSector:true,
         highlightBySize:true,
         gradient:'linear'
        }
    );  

In the doc "https://jsxgraph.org/docs/symbols/Chart.html"

setAttribute and setProperty are documented. But when I try chart2.setAttribute({visible:true}) -- i have setted the property false by default, the return is

char23.setAttribute is not a function.

So the question is how to have access to the parameters of a chart ?