A code fragment such as

Image {
 url = "{__DIR__}/anotherDir/imagefile.gif"
}

fails.

 While
Image {
 url = "{__DIR__}anotherDir/imagefile.gif"
}


works. In "Java" an extra delimiter such as "/" in a path expression is easily handled. Here in JavaFX it seems to choke. It's may appear trivial, but it improves code readability.
Would be nice if it's fixed.

/rk