ofxcontrolpanel and ButtonSlider

hello forum.

i started using the ofxcontrolpanel and it is really nice. thank you for making it available to us.

i have one question. i am trying to tell the buttonsllider to use integer values by setting the isInt bool to true when adding a new buttonslider. but when running the app it still displays floats.
setting isInt for the normal slider works fine.

am i doing something wrong?

gui.addButtonSlider(<#string sliderName#>, <#string xmlName#>, <#float value#>, <#float min#>, <#float max#>, <#bool isInt#>);

thank you,
stephan.