how can i make resize to controls(Panel ,Grid,scroll bar viewer) itself when window is maximize in .net

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C#

VB

WPF

C#4.0

I create a small application in which, i want when my window(WPF) is maximized it's controls are also resized according to window size.I tried this code-

Private Sub Maximize_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles Maximize.Click
If Me.WindowState = Windows.WindowState.Maximized Then
        Me.WindowState = Windows.WindowState.Normal
        Me.Width = 820
        Me.Height = 440
        Me.Grid1.Width = 780
        Me.Grid1.Height = 400
        Me.StackPanel1.Height = 360
        Me.StackPanel1.Width = 140
        Me.StackPanel2.Height = 360
        Me.StackPanel2.Width = 600
 Else If Me.WindowState = Windows.WindowState.Normal Then
        Me.WindowState = Windows.WindowState.Maximized
        'Me.Width = 1350
        'Me.Height = 600
        Me.Grid1.Width = 1300
        Me.Grid1.Height = 600
        Me.StackPanel1.Height = 460
        Me.StackPanel1.Width = 200
        Me.StackPanel2.Height = 460
        Me.StackPanel2.Width = 800
End Sub