Hi Froilan,
Sorry for the late reply. This one somehow must have slipped my mind!
There should be a button that is associated with a Popup_Editor widget somewhere on that page.
Hitting the Enter-key will trigger the one button/link that is set as Default and if this happens to be the one button/link that is bound to a Popup_Editor widget, it could result in a redirect to the Popup_Upload webscreen of the RichWidgets module.
You could open a clone of the RichWidgets module and review the logic yourself. When the Site Property PopupUpload_UseToken is set to True, it will use the Popup_Editor_WithToken Web Block.
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The Popup_Editor_WithToken Web Block in its turn contains some Javascript that clicks on the Open Popup Upload Button whichs redirect the user to the Popup_Upload webscreen.![]()

Hope this helps!
Regards,
Nordin