Cannot add created asset to style

[fi11222 2]

Hi, I have a couple of test assets that I made with blender. I have added them to the asset pool based on growable templates and indedd they are growable. In a test city I have done, I have seen a couple of instances of my assets (image below).

However, I do not seem to be able to add them to a style as the "Add to style" combo box does not appear for them in the content manager (image above). The style I have created does work however and I am able to add other buildings to it that I have obtained from steam.

What did I do wrong ? Thanks in advance.

[fi11222 2]

Found the solutions to my own problem. Assets have to be published (on Steam) to be addable to a style. Isn't that a bit weird?