Adding popup to EAGLView

Hello, I'm trying to modify VirtualButtons sample to show a popup whenever a button is pressed. I added a UILabel to EAGLView.h. In initWithFrame I setup the label and added it: [self addSubview:popupLabel];At this point it shows up as expected. But now I'm trying to change the text dynamically and it's not working somehow. What I would like is to change the text depending on which button is pressed. I thought I would just have to change the label text in if (button->isPressed()) but somehow this doesn't work. If I put 'popupLabel.text = @"text" in postInitQCAR, the label changes but when I place the text in renderFrameQCAR it doesn't work.If I change the label both in postInitQCAR and renderFrameQCAR, it works if I put the code before [self setFramebuffer];For example: popupLabel.text = @"render 2";[self setFrameBuffer];popupLabel.text = @"render 3"; The text shows up as 'render 2' instead of 'render 3'. Can someone help me?  native SDK: vuforia-sdk-1-5-8MacOS version number: 10.6.8Xcode version number: 4.2iPhone 4 GSMiOS version: 5.1.1