Some text background get messed up with "Windows Classic" style activated

[VivienRuizFei]

Hello,

When using an InnoSetup custom style on a Windows 7 computer that have the "Windows Classic" style activated, some texts end up having an unexpected white background. It happens on some radio buttons or checkboxes.

Switching to Windows Basic style or Windows Aero displays the expected rendering:

I have noticed that the checkboxes generated by InnoSetup behave correctly (don't mind the different colors, this capture does not come from the sample but from our actual app):

Is there something to do that you can recommend ?
Here is the sample file I have been using:
VCLStylesDemo.zip

Thanks !

Vivien