My non-focused tabs in my tab control(s) in IWP are the color grey.

I have them set to white in Filemaker.

Can anyone suggest a method to change the color of the non-focused tabs in IWP?

Tab controls and IWP don't get along very well. Among the color issue, they are also one of many triggers for a random 701 error which shuts down the web processing engine on the server (which then has to be manually restarted). It's a known issue, but wasn't fixed in the last FMSA12 patch.

My advice is to get rid of the tabs (at least for your IWP clients) and make a faux-tab solution with separate layouts and graphic object rectangles. This would solve your color problem and all you'd have to do to make the layouts is copy/paste your layout items from each tab to a separate layout so every tab item is a different layout. Then set each rectangle as a button to go to the desired layout.

..wish it were easier.

Ok.. thanks for your reply

Yeah - it's far from graceful. Maybe v3 will bring hope.