<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="MAUI.MainPage"
             xmlns:telerik="clr-namespace:Telerik.Maui.Controls;assembly=Telerik.Maui.Controls"
             BackgroundColor="White">
    <telerik:RadDockLayout x:Name="dockLayout">
        <Grid HeightRequest="60"
          telerik:RadDockLayout.Dock="Top">
            <Label  Text="Header" HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand" FontSize="Medium"/>
        </Grid>
        <Grid 
        telerik:RadDockLayout.Dock="Bottom">
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto"/>
            </Grid.RowDefinitions>
            <Label  Text="CopyRight" HorizontalOptions="EndAndExpand" VerticalOptions="CenterAndExpand" FontSize="Caption"/>
        </Grid>
        <Grid 
        telerik:RadDockLayout.Dock="Left">
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="Auto"/>
            </Grid.RowDefinitions>
            <telerik:RadButton Grid.Row="0" Grid.Column ="0" Text="Button 1" HorizontalOptions="Start" VerticalOptions="Center" Clicked="OnButton1Clicked"/>
            <telerik:RadButton Grid.Row="1" Grid.Column ="0" Text="Button 2" HorizontalOptions="Start" VerticalOptions="Center" Clicked="OnButton2Clicked"/>
        </Grid>
        
        <Grid >
            <ContentView  x:Name="cuurentContentView"/>
        </Grid>
    </telerik:RadDockLayout>
</ContentPage>

public partial class MainPage : ContentPage
{
	public MainPage()
	{
			InitializeComponent();
	}

    private void OnButton1Clicked(object sender, EventArgs e)
    {
		cuurentContentView = new DashboardView();
    }

    private void OnButton2Clicked(object sender, EventArgs e)
    {
        cuurentContentView = new RoutesView();
    }
}

     <telerik:RadButton Text="Test"   ImageSource="home.png" WidthRequest="150" />