Attempt to style direct property should fail with compile time error

[maxkatz6]

Is your feature request related to a problem? Please describe.

Direct properties should never be used inside of style setters, but it is possible right now and it results in confusion and sometimes in applications with bugs.
This behavior is known and already documented, but still confuses new developers.

[PieroCastillo]

you right, but... why would you wanna use Direct props inside styles?, for that exists Style props...

[maxkatz6]

@PieroCastillo it's not a question about "why?", but question about "if it's not supported, then why user is allowed to do so?".
So, this issue is to disallow direct props inside of styles.

[RomanSoloweow]

It's a shame it's very handy with x: Static

[maxkatz6]

@RomanSoloweow as it was discussed, building state machine on styles isn't something they were designed for. Usually your task would require Items source changing in ViewModel layer depending on state of this view model. Where View is only bind to it and styles are using exclusively for actual styling.

Even though I don't mind new approaches, our styling system just isn't really suitable for that.