Update property of some type with other window

[WojTec]

Continued old thred about frames...

So, on frame I have color selector. How can I assign choosed color in "real time" to any color property on main form (selecting color from image by mouse down and moving cursor)? When I want to modify object it's simple, because I can do it by pointer, but how about simple types?

I added field FColor: PColor. When picking color C := SelectedColor and then FColor := @C. Don't working.