Trouble with Navigation Bar in MasterDetail Page

Hi

I'm having trouble with the MasterDetail Navigation on the detail page. I would ultimately like to hide the navigation bar so that I can create a very custom look and feel I have tried adding NavigationPage.SetHasNavigationBar(this, false); for every page I can think of, Master, Detail and MasterDetail Parent page. nothing seems to work.

Failing that is it possible to center align the text in the Navigation Bar. I'm having great difficulty customizing the look and feel of the Nav. I'm also having trouble changing the default image on the Nav bar, when I try set the Image Property it adds the image in front of the app image.

Any help will be greatly Appreciated. Below is a code snipt of my master page

    public MenuPage()
    {
        NavigationPage.SetHasNavigationBar(this, false);    
        Title = "Trender";
        Icon = "MenuIcon.png";
}