I can't seem to find the option to display the expressions window while debugging.
As seen here, there should be a tab called expressions.
I can't find any option nor any symbol that looks like it on my machine (Windows 7 64-bit, Dart/sdk/editor 0.5.* 32 bit).
I can't find anything on Google or Stack Overflow and I have been searching for over a day now. What am I missing?
Those docs need to be updated - we removed the expressions editor a while ago. It's going to be replaced with an object inspector, which will be more full featured and have a better UX.