WPF

<TabControl  x:Name="MyTabControl" ItemsSource="{Binding ViewModels}" Margin="4"
            Background="#DCE8F3"
            SelectedIndex="0"
            BorderBrush="LightGray"
            TabStripPlacement="Top">
    <TabControl.Resources>
        <DataTemplate DataType="{x:Type vm:SmartCardViewModel}">
            <view:SmartCardView/>
        </DataTemplate>
        <DataTemplate DataType="{x:Type vm:RfidLogFileViewModel}">
            <view:LogFileView/>
        </DataTemplate>
        <DataTemplate DataType="{x:Type vm:VideoLogFileViewModel}">
            <view:LogFileView/>
        </DataTemplate>
    </TabControl.Resources>
    <TabControl.ItemTemplate>
        <DataTemplate>
        <TextBlock Text="{Binding Name}"/>
        </DataTemplate>
    </TabControl.ItemTemplate>
</TabControl>

<UserControls:SQLFilterSettings DataContext="{Binding Path=Criteria}"/>

<ResourceDictionary Source="/Resources/UserControlResources.xaml" />

<Grid xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Name="themeGrid">
    <Image Height="Auto" HorizontalAlignment="Left" Margin="0" Stretch="Fill" VerticalAlignment="Top" Width="Auto">
        <Image.Source>
            <BitmapImage UriSource="pack://siteoforigin:,,,/Resources/image1.jpg" CacheOption="OnLoad" />
        </Image.Source>
    </Image>
</Grid>

Imports System.IO
Class MainWindow
    Private Sub MainWindow_Loaded(sender As Object, e As System.Windows.RoutedEventArgs) Handles Me.Loaded
        loadInterface()
    End Sub
    Sub loadInterface()
        ' Load xaml file as content of the window
        Dim GridUri As String = System.AppDomain.CurrentDomain.BaseDirectory & "Resources\theme.xaml"
        Dim fs As FileStream = New FileStream(GridUri, FileMode.Open, FileAccess.Read)
        Dim sri = TryCast(System.Windows.Markup.XamlReader.Load(fs), Grid)
        Me.Content = sri
        fs.Close()
    End Sub
End Class

<Grid xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Name="themeGrid">
    <Image Height="Auto" HorizontalAlignment="Left" Margin="0" Stretch="Fill" VerticalAlignment="Top" Width="Auto">
        <Image.Source>
            <BitmapImage UriSource="pack://siteoforigin:,,,/Resources/image1.jpg" CacheOption="OnLoad" />
        </Image.Source>
    </Image>
    <Label FontFamily="pack://siteoforigin:,,,/Resources/#Digital-7" Content="Have a nice day!"/>
</Grid>

<Frame x:Name="_home"     NavigationUIVisibility="Hidden" HorizontalAlignment="Stretch"   Width="2749" Margin="0,12,0,0"   />

(Application.Current.MainWindow.FindName("_home") as Frame).Source = new Uri("/F1.xaml", UriKind.Relative);

<pre lang="c#">private void btnCalculate_Click(object sender, RoutedEventArgs e)
 {
     F1 f1 = new F1();
     f1.CalculateYear();
 }</pre>

using System;
using System.Windows;
using System.Windows.Media;
using System.ComponentModel;
using System.Windows.Input;

namespace WpfPrismTests
{

    public class CanvasPoint : FrameworkElement, INotifyPropertyChanged
    {

        private VisualCollection _children;

        #region "Constructors"
        public CanvasPoint()
        {
            _children = new VisualCollection(this);
            _children.Add(CreateDrawingVisualCircle());

        }

        protected override void OnMouseEnter(MouseEventArgs e)
        {
            base.OnMouseEnter(e);
        }

        public CanvasPoint(Point p_position)
        {
            PositionOnCanvas = p_position;

            _children = new VisualCollection(this);
            _children.Add(CreateDrawingVisualCircle());
        }
        #endregion

        private DrawingVisual CreateDrawingVisualCircle()
        {
            DrawingVisual drawingVisual = new DrawingVisual();

            // Retrieve the DrawingContext in order to create new drawing content.
            DrawingContext drawingContext = drawingVisual.RenderOpen();

            // Create a circle and draw it in the DrawingContext.
            drawingContext.DrawEllipse(BackgroundColor, new Pen(BackgroundColor, 1.0), PositionOnCanvas, 4, 4);

            // Persist the drawing content.
            drawingContext.Close();

            return drawingVisual;
        }

        #region "Dependency Properties"

        public static DependencyProperty ShowContentProperty = DependencyProperty.Register("ShowContent",
            typeof(bool), typeof(CanvasPoint), new PropertyMetadata(false, OnShowContentPropertyChanged));

        public bool ShowContent
        {
            get
            {
                return (bool)this.GetValue(ShowContentProperty);
            }
            set
            {
                this.SetValue(ShowContentProperty, value);
            }
        }

        private static void OnShowContentPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            bool value = (bool)e.NewValue;
            CanvasPoint thisElement = d as CanvasPoint;
            if (value)
            {
                thisElement.AddLogicalChild(thisElement.Content);
            }
            else
            {
                thisElement.RemoveLogicalChild(thisElement.Content);
            }

        }

        private static FrameworkPropertyMetadata ContentMetadata =
                      new FrameworkPropertyMetadata(null,
                               FrameworkPropertyMetadataOptions.BindsTwoWayByDefault);

        public static readonly DependencyProperty ContentProperty =
            DependencyProperty.RegisterAttached("Content", typeof(UIElement),
                typeof(CanvasPoint), ContentMetadata);

        public UIElement Content
        {
            get
            {
                return (UIElement)this.GetValue(ContentProperty);
            }
            set
            {
                this.SetValue(ContentProperty, value);
            }
        }

        #endregion

        #region "Properties"

        private Point p_PositionOnCanvas = new Point();
        public Point PositionOnCanvas
        {
            get { return p_PositionOnCanvas; }
            set
            {
                p_PositionOnCanvas = value;
                INotifyChange("PositionOnCanvas");
            }
        }

        private SolidColorBrush pBackgoundColor = Brushes.Red;
        public SolidColorBrush BackgroundColor
        {
            get { return pBackgoundColor; }
            set
            {
                pBackgoundColor = value;

                _children.Clear();
                _children = new VisualCollection(this);
                _children.Add(CreateDrawingVisualCircle());
            }
        }
        #endregion

        #region "Overided properties"

        // Provide a required override for the VisualChildrenCount property.
        protected override int VisualChildrenCount
        {

            get
            {
                if (this.ShowContent)
                {
                    UIElement childElement = (UIElement)GetValue(ContentProperty);
                    return childElement != null ? 1 : 0;
                }
                else
                {
                    return _children.Count;
                }
            }
        }

        // Provide a required override for the GetVisualChild method.
        protected override Visual GetVisualChild(int index)
        {
            if (this.ShowContent)
            {
                return (UIElement)GetValue(ContentProperty);
            }
            else
            {
                if (index < 0 || index >= _children.Count)
                {
                    throw new ArgumentOutOfRangeException();
                }

                return _children[index];
            }
        }

        protected override Size MeasureOverride(Size availableSize)
        {
            UIElement childElement = (UIElement)GetValue(ContentProperty);
            if (childElement != null)
                childElement.Measure(availableSize);

            return availableSize;
        }

        protected override Size ArrangeOverride(Size finalSize)
        {
            UIElement childElement = (UIElement)GetValue(ContentProperty);
            if (childElement != null)
            {
                Rect ChildSize = new Rect(new Point(0, 0), finalSize);
                double CenterX = ChildSize.Width / 2;
                double CenterY = ChildSize.Height / 2;
                childElement.Arrange(new Rect(new Point(-CenterX + PositionOnCanvas.X, -CenterY + PositionOnCanvas.Y), finalSize));
            }

            return finalSize;
        }


        #endregion

        public event PropertyChangedEventHandler PropertyChanged;

        protected void INotifyChange(string name)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(name));
            }
        }

    }
}

protected override Size ArrangeOverride(Size finalSize)
{
    UIElement childElement = (UIElement)GetValue(ContentProperty);
    if (childElement != null)
    {
        Rect ChildSize = new Rect(new Point(0, 0), finalSize);
        double CenterX = ChildSize.Width / 2;
        double CenterY = ChildSize.Height / 2;
        childElement.Arrange(new Rect(new Point(-CenterX + PositionOnCanvas.X, -CenterY + PositionOnCanvas.Y), finalSize));
    }

    return finalSize;
}