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I want to add a navigation bar in side my views to move to sub view

However when i change the side menu bar selected item nothing show

here is the project sours code

What I have tried:

I tried dataTemplen in app.xaml

<DataTemplate DataType="{x:Type vm:AddPepoleViewModel}">
                <v:AddPepoleView />

            <DataTemplate DataType="{x:Type vm:PepoleHomeViewModel}">
                <v:PepoleHomeView />

and also in the pepole view

                            <DataTemplate DataType="{x:Type vm:AddPepoleViewModel}">
                                <local:AddPepoleView />

                            <DataTemplate DataType="{x:Type vm:PepoleHomeViewModel}">
                                <local:PepoleHomeView />
Updated 21-Feb-22 2:15am

I had a quick look at your github code and it is incomplete. ViewModels are missing. So I could not run your code to see what you are trying to do.

Looking at the code above, you're trying to navigate by ViewModel.

Here is your code for the MainWindow:
    <!-- trimmed -->
    <Grid Background="{StaticResource ViewMainBackGroundBrush}">
        <Border Style="{StaticResource ViewItemBorder}">
            <Grid HorizontalAlignment="Center" VerticalAlignment="Center">
                <TextBlock Foreground="White" Text="Main View" />

You currently have not implemented the host for your ViewModels to display any views. You need to implement something like this:
<Window x:Class="app.MainWindow"
        Title="page name goes here" Height="900" Width="1200">

        <ContentControl Content="{Binding CurrentViewModel}" />

and the code behind would look something like this:
public partial class MainWindow
    public MainWindow(IMainViewModel viewModel)
        this.DataContext = viewModel;

And your MainViewModel to change views would be something like this:
public class MainViewModel : NavigationViewModelBase, IMainViewModel
    public MainViewModel(INavigationStore navigationStore) : base(navigationStore)

public abstract class NavigationViewModelBase : ViewModelBase
    private readonly INavigationStore _navigationStore;

    public ViewModelBase CurrentViewModel => this._navigationStore.CurrentViewModel;

    protected NavigationViewModelBase(INavigationStore navigationStore)
        this._navigationStore = navigationStore;
        this._navigationStore.CurrentViewModelChanged += this.OnCurrentViewModelChanged;

    private void OnCurrentViewModelChanged() => this.OnPropertyChanged(nameof(this.CurrentViewModel));

INavigationStore is just a way of passing the CurrentViewModel that you wish to display from your navigation / SideMenu.
Member 7912784 21-Feb-22 4:36am
ViewModels are in it own project and it is in the project

Graeme_Grant 21-Feb-22 4:44am
Check your github. There is a project named HoursTrans.ViewMoudels but no ViewModel classes, only Command classes and Menu classes.
Member 7912784 21-Feb-22 6:45am
I'm sorry about that. Uploaded
Graeme_Grant 21-Feb-22 8:18am
Your code is very tightly dependent. I would be very concerned with memory leaks. It looks like a binding in your sub menu is not firing correctly. Please see my comments in Solution 2.
It looks like you have a binding issue. INotifyPropertyChanged does not look like it is correctly implemented.

Your code:
public event PropertyChangedEventHandler PropertyChanged = (sendr, e) => { };

Corrent implementation:
public event PropertyChangedEventHandler PropertyChanged;

public void OnPropertyChanged([CallerMemberName] string propertyName = null)
    => this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));

This would be a key change that I would make.
Member 7912784 21-Feb-22 8:23am
There is NuGet Package called PropertyChanged.Fody It mange all that

That's why Main Navigation work
Graeme_Grant 21-Feb-22 8:31am
You have a binding issue regardless.
Member 7912784 21-Feb-22 8:33am
Where is that, i can't find
Graeme_Grant 21-Feb-22 8:37am
<ContentControl DataContext="{Binding SideNaveer.SelectedView}">...</ContentControl> in People.xaml binding is not working.
Member 7912784 21-Feb-22 8:40am
Found it Thank you so much for your help
Member 7912784 21-Feb-22 8:45am
This is The wrong code
<contentcontrol datacontext="{Binding SideNaveer.SelectedView}">... in People.xaml binding is not working.

The fix
<contentcontrol content="{Binding SideNaveer.SelectedView}">
Member 7912784 21-Feb-22 8:47am
Thank you Graeme_Grant for your help

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