@Glyn Oh yeah, that's what I would have suggested first – watch David's video on that. That will guide you pretty well through this process.
And what's important too (maybe David even says that in the video): Make sure you get the appropriate XCode Version for your machine/system. I'm running Mojave 10.14.6 with XCode 10.3. But it might be a different version for yours. You can read details for each version on the version history archive: https://xcodereleases.com/

@d-healey I got i t working. I had to paint the panel background blue as i was unsure if the black key was being painted properly. Screenshot 2021-07-18 at 13.53.50.png

You were so right, re writing the if statement properly made it make sense in my head. I noticed there was a * missing in the fillRect array, I wondered why i was getting errors then realise i wasnt timesing I by anything ;)

Screenshot 2021-07-18 at 13.54.18.png

cheers David and @Lindon cheers Lindon too

@Glyn Have fun!

@d-healey Will do, had a feeling you might have a video about it ;) cheers

@ustk Fantastic, ile try this now. Thanks for the useful pointers :)

@d-healey @ulrik Hey guys i sorted it. I found an even easier way.

I closed the project and opened up HISE again and then clicked View>Reset Workspaces and closed HISE.

I then opened HISE up again and Property Editor now appears again. Thanks so much for your help ,Much appreciated