Toolbar Confusion

I have a toolbar in my project and have images in it 32x32. They look great on the mac but when run
in windows they are HUGE so I tried 16x16 images and they look ok in windows but on mac they are
so small. Do I have to build a separate toolbar for each platform programmatically to get the correct
icon sizing for the OS the program is running on ?

where a similar answer was provided for a similar question

Yea and I was the one that asked it. Trouble was 32x32 did not work on both platforms.
After doing more test I found that icons .42x.42 inches with a resolution of 72 pixels/inch
works great on both mac and windows platforms for the main toolbar.

Ok… all I can say is the toolbar mentioned in that topic is in use by myself and others in both Win and OSX