I just found out what was going wrong with our template.
The bindings were set wrong...
I based the bindings on other bindings already made, but for this part of the control, some things were not necessary.
<!--This was wrong-->
<!--This worked :)-->
I used the binding above because it was like that in other part of the code. Sadly, it didn't work for what i needed.
Well... I'm kind of new with bindings...