I created an online or downloadable gitbook.com:
Creating Controls In Assembler
Use the Win32 API and assembly language to create custom controls for windows
https://mrfearless.gitbooks.io/creating-controls-in-assembler
The book introduces the reader to my journey and techniques I discovered and evolved over time, for creating custom controls using the windows win32 API and Microsoft's Macro Assembler (Masm).
It covers the main areas of developing an example control, SimpleButton, which the reader can then use as basis for creating their own custom controls.
Hopefully it is interesting and/or useful to someone.
I created the book for a few reasons: because I felt there wasn't many tutorials covering custom control creation using assembler (there are a few written for c/c++ users), to give programmers an overall sense of how windows controls work internally (which might aid in reversing or understanding of the api calls used in that case), and to share my knowledge for other potential assembler that use the windows api.
I hope that readers will take what is relevant for them from reading the book (windows internals, assembler code usage etc) and/or be able to create their own using the example in the book as a template, and to see that using assembler with windows is still viable for creating modern style user interfaces.