1. When I try to import a model (those models are attached to this post), I am getting the below error.

Error:An exception occurred while generating the template.
Object reference not set to an instance of an object.
at Xenko.Assets.Models.ModelAssetImporter.Import(UFile localPath, AssetImporterParameters importParameters)
at Xenko.Assets.Presentation.Templates.ModelFromFileTemplateGen

Reticketed from apitrace/apitrace#413

Compilation fails without X11 on fresh Linux system while https://github.com/apitrace/apitrace/blob/master/docs/INSTALL.markdown#linux docs says it is optional.

Log from fresh Ubuntu container:

lxc launch ilo:ubuntu/wily/amd64 apitrace
lxc exec apitrace bash
# apt-get install g++ cmake git python
# git clone https://github.com/ap

It would be really nice to have a more complete set of tutorials/samples to work with.

E.g. None of the samples use Geometry Instancing,Indirect Buffers.
From the Vulkan/Metal docs it is also not clear, because each API handles this slightly differently.

Best,
Marc

1. UI is displayed incorrectly.
   D9VK
   
   D3D9 Native
   

2. Bifurcation of objects
   D9VK
   ![mm3](https://user-images.githubusercontent.com/45942960/67120136-58c18280-f1f1-11e9-9be5-82

Is your feature request related to a problem? Please describe.
Standard mode has the usual keystrokes for notepad, but there are more that would probably be useful.

Describe the solution you'd like
As a first step, a quick review of the common keystrokes in notepad/wordpad/work, for example might throw up some obvious ones we could add

The API for the editor plug in system is poorly documented, and worse, haphazard in implementation, perhaps allowing for a little too much freedom and not much in the way of direction (see differences between rendering and view functionality for sprite editor and image editor).

To mitigate this the documentation will be improved, explaining each interface and how it relates usage in plug ins. W