How to handle key events in popup component

Is there any possibility to handle keyboard events after a popup is opened
requirement : I want to close popup when I press escape key (by default this functionality is present but in some scenarios this is not working ) so explicitly i want to handle key events for popup.
Thanks,
Raghavendra.

in my application header part of the page is common of all page. header.jsff contains comandmenuItem named "proceduralhelp". if I click proceduralhelp a pop up opens .
in my login page when first time I open popup and press escape popup is not closing.
rest of the cases after login escpe will cose the popup.
only on the loginpage that to for the first time it is not closing when pressing up on escape key. (then we click on close button. and once again open the popup in loginpage now if we press escape it works).
Thanks,
Raghavendra.

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