MixBook ( http://www.mixbook.com/create/tool?d=1 ) is using a comboBox with a vertical slider instead of a dropdown box to change the fontsize of a text (select a textfield and the comboBox on the floating toolbar).
I was wondering if this is a default functionality of the comboBox, which I don't know about or a custom component. I tried to find something on Google, but couldn't find anything. I guess they made it specifically for that application. I'd like to create something like it, since it makes changing fontsize a lot faster. Before looking in the code of the comboBox class, I'd like to have some suggestions on how to do this (or a link to a downloadable custom component ;)).

