Mult-Text with Log Edits (edit mode). Button to Display "Show All Entries"

I have a multi-line text field, [All Project Updates], with log edits enabled. In edit mode in order to see all lines in the record one must click the Show All Entries. In View mode instead of showing all entries we have created a field that displays only a portion of the entries (List("\n",Part([All Project Updates], 2,"["), Part([All Project Updates], 3,"[")), When in view mode my user would like a button that Shows All Entries, I suggested a Tab with only the field [All Project Updates] included, but that didn't fly :/ 

Can anyone tell me what the URL or test formula for this button might be?

The reason for this button is the following logic:
User views the abbreviated version of All Project Update in view mode.
User decides they need to be shown all Entries for the field in view mode.
User hits our new button and a pop up appears with all of the entries shown
User then decides to go in to edit mode to enter more notes.

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George Bramhall
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