WPF DynamicGrid python and XAML layout files (pythonnet#280)

demo/DynamicGrid.py

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+import clr
+import sys
+if sys.platform.lower() not in ['cli','win32']:
+    print("only windows is supported for wpf")
+clr.AddReference(r"wpf\PresentationFramework")
+from System.IO import StreamReader
+from System.Windows.Markup import XamlReader
+from System.Threading import Thread, ThreadStart, ApartmentState
+from System.Windows import Application, Window
+
+
+class MyWindow(Window):
+    def __init__(self):
+        stream = StreamReader("DynamicGrid.xaml")
+        window = XamlReader.Load(stream.BaseStream)
+        Application().Run(window)
+
+
+if __name__ == '__main__':
+    thread = Thread(ThreadStart(MyWindow))
+    thread.SetApartmentState(ApartmentState.STA)
+    thread.Start()
+    thread.Join()

demo/DynamicGrid.xaml

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+<Window 
+       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
+       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
+       Title="WpfApplication1" Height="300" Width="300">
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="*"/>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="*"/>
+        </Grid.RowDefinitions>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="*"/>
+            <ColumnDefinition Width="Auto"/>
+            <ColumnDefinition Width="*"/>
+        </Grid.ColumnDefinitions>
+        <Label Content="Left" Grid.Column="0" Background="LightBlue" />
+        <GridSplitter 
+                    VerticalAlignment="Stretch" 
+                    HorizontalAlignment="Stretch"
+                    Grid.Column="1"
+                    Width="5" 
+                    Grid.RowSpan="3"/>
+        <Label Content="Right" Grid.Column="2" Grid.Row="2" Background="LightBlue" />
+        <Label Content="Top" Grid.Column="2" Background="LightGreen"/>
+        <GridSplitter 
+                    HorizontalAlignment="Stretch"
+                    VerticalAlignment="Stretch"
+                    Grid.Row="1"
+                    Width="Auto"
+                    Height="5" 
+                    Grid.ColumnSpan="3"/>
+        <Label Content="Bottom" Grid.Column="0" Grid.Row="2" Background="LightGreen" />
+    </Grid>
+</Window>