[TYPO3-english] To backend layout or not to backend layout that's the question?

["HocomAdvies [  Wiechert Hooghwinkel]

Hi, this might sound as a dumb question, but something is not completely clear to me. When applying Grid elements for creating a new content element, its possible to include both the  pageTS and  TS settings like this:

In the main template:
<INCLUDE_TYPOSCRIPT: source="FILE:fileadmin/templates/gridelements/my_grids/setup.txt">
And in the (home) page:

<INCLUDE_TYPOSCRIPT: source="FILE:fileadmin/templates/gridelements/my_grids/page_ts.txt">

Only this is not providing any new content element in the back end. I still have to create a new back end layout. Only than the element is available in the back end. But than the page_ts.txt file is not needed, right? 

So the question is, does one still have to create a back end layout for every grid-element or not? All the samples I saw showing the "include manner" did not mention this. And for more flexibility (reusing the grid elements) it seems logic that having it this way is more logic.

Am I overseeing something here? Any advise please. Thanks. 

Best Regards,
HocomAdvies

Wiechert