Dynamic Caption in SubPage (ListPart)

Schuppi

Hello,

i've got a Problem with setting a dynamic Caption in a subpage. My Problem ist, that the Caption doesn't change.
If i run that Page separately, it uses the individual caption, but in the mainpage, it doesn't.

Is it possible to do this in NAV? Actual we use NAV 2015.

For Example, we uses this code for changing the caption for the subpage in die mainpage:
CurrPage.subpage.PAGE.CAPTION('Pagename Test');
But it uses the caption of the Page or if that caption field is filled, it uses that caption for the subpage.

Do you have any ideas?

Thx