Photoshop Javascript change layer color

//

var docRef = app.activeDocument;

//displayDialogs = DialogModes.ALL

// define your fill color

var color = new SolidColor();

color.rgb["hexValue"] = "7f7f7f";

var  monCalc = app.activeDocument.artLayers.getByName("CLASS2HEX");

docRef.activeLayer =  monCalc ;

for ( j=0;j<docRef.layers.length;j++) //masquer tous les calques

         {

            docRef.layers.visible=false;

         } 

monCalc.visible=true;

var moncalc2 = monCalc.duplicate();//conserver le texte original

pixeliser();//Transformer le calque texte en calque simple

//Rogner

docRef.trim(TrimType.TOPLEFT, true, true, true, true);

//var class2hex = app.activeDocument.artLayers.getByName("CLASS2HEX");

//             alert(class2hex.kind) // LayerKind.SOLIDFLL

for ( j=0;j<docRef.layers.length;j++) //Demasquer tous les calques

         {

            docRef.layers.visible=true;

         } 

moncalc2.visible=true;

// perform select all & fill the document

// monCalc

docRef.selection.selectAll();

docRef.selection.fill(color);

docRef.selection.deselect();

function pixeliser()

{

var idMk = charIDToTypeID( "Mk  " );

    var desc165 = new ActionDescriptor();

    var idnull = charIDToTypeID( "null" );

        var ref14 = new ActionReference();

        var idSnpS = charIDToTypeID( "SnpS" );

        ref14.putClass( idSnpS );

    desc165.putReference( idnull, ref14 );

    var idFrom = charIDToTypeID( "From" );

        var ref15 = new ActionReference();

        var idHstS = charIDToTypeID( "HstS" );

        var idCrnH = charIDToTypeID( "CrnH" );

        ref15.putProperty( idHstS, idCrnH );

    desc165.putReference( idFrom, ref15 );

executeAction( idMk, desc165, DialogModes.NO );

}