boxText parameters not updating

Hello,

I have problem with changing parameters for boxText.

I can manipulate Position and BoxTextSize, but fontSize doesn't change no matter what I write.

At the end of the script I put alert box, and when I check textDocument fontSize it gives me correct value,

but in Comp window, boxText is always the same size.

Here is code

(my text string is in variable s1Atxt1OK)

var ttPlac = app.project.item(5).layers.addBoxText([1050, 100]);

ttPlac.property("ADBE Transform Group").property("ADBE Position").setValue([880, 800]);

var textProp = ttPlac.property("Source Text");

var textDocument = textProp.value;

textDocument.resetCharStyle();

textDocument.resetParagraphStyle();

textDocument.fontSize = 100;

textDocument.fillColor = [1, 1, 1];

textDocument.font = "HelveticaNeueLTPro-BdCn";

textDocument.applyStroke = false;

textDocument.applyFill = true;

textDocument.text = s1Atxt1OK;

textDocument.justification = ParagraphJustification.LEFT_JUSTIFY;

textDocument.tracking = -10;

textProp.setValue(textDocument);

// checking with alert that font size is updated (because in comp window it doesn't change)

var box = textDocument.fontSize;

alert(box);

Thanks,

Goran