Show PopupList on key press?

I want to make a script (C# or Javascript doesn’t matter). If I press the key “E” a GUImenu shows up. Like this (see attachment)
I don’t know how to do this! Any help would be great!

~Benjamin

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Bump

What have you tried? What have you coded? What have you googled? Which tutorials have you read? Which language do you use?

We are not here to do the job for you, just to help you on some specific issue you have in specific snippet of code.