List<BlockDoc> getExtensionBlocks() {
        List<BlockDoc> blocks = []
        mixinClasses.each { mixin ->
            mixin.classBlocks.each { block ->
                blocks << block.forClass(targetClass)
            }
        }
        extraBlocks.each { block->
            blocks << block.forClass(targetClass)
        }
        return blocks.sort { it.name }
    }