With UWP, I’m finding myself overriding the control templates of existing controls.  Creating these control templates from scratch is not even on the table as a realistic possibility.  So, coders typically use debug code to print out a control template, load a control in Blend, or what I’m now using:

https://msdn.microsoft.com/en-us/library/windows/apps/mt299122.aspx

Back in WPF, I do not recall seeing a cheatsheet like this.