shortcut to open popup with implementation in editor [similar to Ctrl + Alt + B but just a popup]

Hi All

When editing a java code file, I' d like to popup the implementation for a selected method

This is similar to [Ctrl + Click]  or [Ctrl + Alt + B] except the fact that I don't want to open the file in a new tab, I just want quickly take a look to the implementation of the selected method in a popup. 

I'm looking for a shortcut to do this.

do you know is this possible ?

Regards