Why QtCreator uses wrong font and how to fix it?

I have to use rather large fonts in my system (Windows 7). But QtCreator doesn't use my system settings and font is not the default one and it is very small. More strange is that in some widgets QtCreator uses the correct font, look at this:
Attachment 9881
In the left panel the correct font is used, but all other widgets on the right side have very small font. How do I change this small font that is almost not readable for me?

Other applications that use native widgets (like MSVC and Eclipse) just use default system font only Qt and Java Swing are broken. For example in Intellij IDEA (that uses Swing) it is possible to configure application font. What can be done with QtCreator so that it will be usable for me?