Using OpenGlControlBase

[Sekoree]

Hi,
I'm trying to play a bit with the OpenGlControlBase to draw some simple stuff (just a triangle), but I can't seem to get it to work.
I'm using danipens AvaloniaOpenGl tutorials as starting point (I know they're a bit outdated, using Ava 11 preview versions, but I doubt that much has changed since then)

The OpenGL page in ControlCatalog works fine for me.
My test code is here
I'm suspecting its some kind if setup parameter that I'm missing but I just can't find it. My end goal is just drawing a texture, I assume that shouldn't be too complicated.