Detecting Escape key

I'm new to coding the Scintilla control. I had "some" success using an 
AutoHotkey wrapper to pass commands to the Scintilla DLL but I still have a 
lot to learn and understand...

How can I detect the user hit the Escape key? My goal to is to hide the 
editor window when user hit Escape.

I tried assigning the Escape key (SCK_ESCAPE) to a command (SCI_LINEDOWN in 
my test -- this would be replaced by another unused or custom command) and 
check if the notify function if an event was triggered when user hit 
Escape. If yes, I could then execute commands to hide the window.

I can see that the key assignment SCI_ASSIGNCMDKEY worked because the line 
down command is executed when user hit Escape. But I can't trap it in the 
Notify function.

Is this a correct approach? Is there another approach to detect a key 
press? 

Thanks for your help.

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