Hi Ogulcan,
Don't overwrite the whole model, If you see the sample that I had provided earlier, I was just overwriting a property that is set it to the model, which is bound to my page title.
If possible, can you create a plunk of your code here? Plunker
P.S - Make sure you don't just copy and paste the full code as it might be having some confidential information, just create a look-alike sample code on what you have been trying.
Thank you!
Regards,
Sai Vellanki.