How to capture sy-ucomm BACK EXIT or CANCEL button in webdynpro from inbox

I have a webdynpro which is triggerd by a inbox item (the inbox item is now reserved), on pressing BACK EXIT or CANCEL i want to release the inbox item.
In de webdynpro view methode WDDOEXIT i can do this butr i need to know if one of the three buttons ( BACK EXIT or CANCEL) is pressed by the user.
sy-ucomm is empty.
Is there a way to find out if a GUI button is preesed??
Grtz and thanks
RIchard

hi, thanks for your response!
I can't use your hint, because with the code:
SELECTION-SCREEN BEGIN OF screen 100 as window.
there will be a "GENERATED" screen. This means, there
is a screen with all the input fields und the label 100 which I can't
edit! Because if I edit this screen and activate my source again,
my changes will be undone!
So is my question, if there is another system-field than sy-ucom?

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This question may sound kind of strange - isn't that obvious?
While, it is in fact a very important and difficult issue for UI app implementations when UI flow should be kept persistant. I have been feeling confused when doing UI implementations in Personas, specially when at some screens I need to add my own "BACK" button in order to go back to the previous screen (which can be different screens depending flow conditions.)
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I have been working in many years on developing UI apps for mobile devices, and there were no such three types of keys for UI navigations. Maybe I missed some special points that is special only on SAP?
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This may not sound that interesting so I will close it to keep our track "clean".
By the way, just want to share some finding - in Personas, when replacing the Exit or Cancel buttons by transactions, I found that "/n" and "SMEN" does not give the same result, and it depends on whether it is the Exit button or Cancel button that is to be replaced.
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In normal report programs when we enable the back , exit and cancel buttons they work fine without writing any code.but its not in the case of Module pool why?
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How to capture sy-ucomm BACK EXIT or CANCEL button in webdynpro from inbox

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