How to hide the navigation bar in a WPF page

Setting ShowsNavigationUI=False on a Page ought to do it. There does seem to be a bug, however, that will cause this to fail in at least one sequence of events:

1. Page is already in NavigationWindow when this is set
2. Page is navigated away and back again

There may be other scenarios I haven't run into yet that make it fail.

To get this to work totally reliably, what I do is ignore the Page.ShowsNavigationUI property entirely and set it instead on NavigationWindow. This seems to be completely reliable.

Here is how this can be done in your Page constructor:

Dispatcher.BeginInvoke(ApplicationPriority.Render, new Action(() =>
{
  var navWindow = Window.GetWindow(this) as NavigationWindow;
  if(navWindow!=null) navWindow.ShowsNavigationUI = false;
}));

If you do this, remember not to set ShowsNavigationUI on any Page object.

FYI, you can also restyle your NavigationWindow any way you like by changing its ControlTemplate. For example this removes everything but the actual page content:

  <Style TargetType="{x:Type NavigationWindow}">
    <Setter Property="Template">
      <Setter.Value>
        <ControlTemplate TargetType="{x:Type NavigationWindow}">

          <AdornerDecorator>
            <ContentPresenter Name="PART_NavWinCP" 
                              ClipToBounds="true"/>
          </AdornerDecorator>
          
        </ControlTemplate>
      </Setter.Value>
    </Setter>
  </Style>

It's a very easy implementation.

<Frame x:Name="_FrameName" NavigationUIVisibility="Hidden" />

Specify to the page Container, the intention to not have a navigation bar, using NavigationUIVisibility property.

<Frame NavigationUIVisibility="Hidden" Panel.ZIndex="1" ... />

If you're using a Frame you can change the Frame's default style to remove the navigation buttons (shown below). The same approach could be done for NavigationWindow. I originally tried setting Page.ShowsNavigationUI and it had no effect. Just add the below style to a ResourceDictionary and it works fine.

<Style TargetType="{x:Type Frame}">
  <Setter Property="Control.Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type Frame}">
        <Border BorderThickness="{TemplateBinding Border.BorderThickness}" Padding="{TemplateBinding Control.Padding}" BorderBrush="{TemplateBinding Border.BorderBrush}" Background="{TemplateBinding Panel.Background}">
          <ContentPresenter Content="{TemplateBinding ContentControl.Content}" ContentTemplate="{TemplateBinding ContentControl.ContentTemplate}" ContentStringFormat="{TemplateBinding ContentControl.ContentStringFormat}" Name="PART_FrameCP" />
        </Border>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>