//Here i'm setting the buttons that move between frames.
//When i add iTextBoxes.gotoAndStop(activeFrame); it errors.
//I want the textbox movieclip frames to switch sync to the main frames.

function controlNext(event:MouseEvent):void { //Go to next frame
    if (activeFrame <= numFrames) {
        iControler.iPlayPause.gotoAndStop(1);
        activeFrame ++;
        gotoAndStop(activeFrame);
        iTextBoxes.gotoAndStop(activeFrame);
        isPaused = false;
        playAll();
    }
}
function controlBack(event:MouseEvent):void { //Go to previous frame
    if (activeFrame >= 2) {
        iControler.iPlayPause.gotoAndStop(1);
        activeFrame --;
        gotoAndStop(activeFrame);
        iTextBoxes.gotoAndStop(activeFrame);
        isPaused = false;
        playAll();
    }
}

//This is the code i have on frame 1 of the iTextBoxes movieclip

stop();
var currentLetter:Number = 0;
function setText(currentMessage:String, textBox:TextField):void {
    var writingInterval:Number = setInterval(autoWrite, 100);
    function autoWrite():void {
        if (currentLetter <= currentMessage.length) {
            textBox.text = currentMessage.substr(0, currentLetter) + "█";
            currentLetter ++;
        } else {
            clearInterval(writingInterval);
            gotoAndStop(nextFrame);
        }
    }
}