[TYPO3-calendar] Extend Cal with own Extension Markers DB Relation

[Sebastian Reinhardt]

Hi,

I extended the Cal-Event Database with own fields (single input fields). 
Works: The Content, which is entered in the new fields of an Event in 
the BE shows up in the FE.

Now I would like to add a selectbox as a new field:
1. I add a new Table in my Extension, where i can enter the (lets say) 
"Groups".
2. I extended the cal-event Table with a new field: selectbox
3. Set the selectbox to "database relation" choosing my table mention 
before (where the Groups are stored)

Now i can select the Groups in an Event using my new Selectbox.
Now when i use the marker for the "Groups-field", the out put is the 
number in the table, not the content of the related Table.

Am i thinking the wrong way?

I would be happy, if sbdy could give me a hint, how i should setup this, 
to use a selectbox when i extend the cal-event.

i hope u get my issue