Gambas3 has an option to install UnitySC which lets you fill out a form and create items which will appear in Unity Dash. The unity plugin, doesnt create an application interface, but you can do that with gambas. Instead, you run UnitySC and fill the form accordingly, to get a link to the item in dash, and Icons, comments, etc. enter image description here

So, when I compiled Gambas3, It did not make an Icon for gambas3 in the Dasah menu. Ah, but I can fix that right now! here using the UnitySC tool, I added gambas3 to the dash menu, and to the unity bar, with the Icon I screen captured from the gambas website.

Gambas  in dash

Gambas in unity bar