Gradle plugin sources linkage

Hi,

i'm developping a gradle plugin and i can't figure out how to link sources when using it in build.gradle.

For example if you're are using com.android.tools.build:gradle:1.3.1, in your build.gradle you may go to sources if you ctrl+click android extension closure. I can't achieve it though my plugin contains sources as well (checked from USER/.gradle/caches/ sources.jar exists)

Thanks for help