diff --git a/samples/ReactiveHistorySample.Base/Views/MainView.axaml b/samples/ReactiveHistorySample.Base/Views/MainView.axaml
index 74150c3..44cf29d 100644
--- a/samples/ReactiveHistorySample.Base/Views/MainView.axaml
+++ b/samples/ReactiveHistorySample.Base/Views/MainView.axaml
@@ -5,31 +5,34 @@
              xmlns:controls="clr-namespace:ReactiveHistorySample.Controls"
              xmlns:views="clr-namespace:ReactiveHistorySample.Views"
              xmlns:vm="clr-namespace:ReactiveHistorySample.ViewModels"
-             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             mc:Ignorable="d" d:DesignWidth="1100" d:DesignHeight="450"
              x:Class="ReactiveHistorySample.Views.MainView">
   <UserControl.DataTemplates>
     <DataTemplate DataType="vm:PointShapeViewModel">
-      <views:PointShapeView/>
+      <views:PointShapeView />
     </DataTemplate>
     <DataTemplate DataType="vm:LineShapeViewModel">
-      <views:LineShapeView/>
+      <views:LineShapeView />
     </DataTemplate>
   </UserControl.DataTemplates>
-  <Grid Margin="4" ColumnDefinitions="150,150,*" RowDefinitions="Auto,*">
+  <Grid Margin="4" ColumnDefinitions="180,200,*" RowDefinitions="Auto,*">
     <Grid Grid.Column="0" Grid.Row="0" ColumnDefinitions="*,*,*">
-      <Button Grid.Column="0" Content="Undo" Command="{Binding UndoCommand}"/>
-      <Button Grid.Column="1" Content="Clear" Command="{Binding ClearCommand}"/>
-      <Button Grid.Column="2" Content="Redo" Command="{Binding RedoCommand}"/>
+      <Button Grid.Column="0" Content="Undo" Command="{Binding UndoCommand}" />
+      <Button Grid.Column="1" Content="Clear" Command="{Binding ClearCommand}" />
+      <Button Grid.Column="2" Content="Redo" Command="{Binding RedoCommand}" />
     </Grid>
     <ListBox Grid.Column="0" Grid.Row="1" Name="shapes" Items="{Binding Shapes}">
       <ListBox.DataTemplates>
         <DataTemplate DataType="vm:LineShapeViewModel">
-          <TextBlock Text="{Binding Name.Value}"/>
+          <TextBlock Text="{Binding Name.Value}" />
         </DataTemplate>
       </ListBox.DataTemplates>
     </ListBox>
-    <ContentControl Grid.Column="1" Grid.Row="0" Grid.RowSpan="2" Content="{Binding #shapes.SelectedItem, Mode=OneWay}" HorizontalContentAlignment="Stretch"/>
-    <controls:LayerCanvas Grid.Column="2" Grid.Row="0" Grid.RowSpan="2" Name="layerCanvas" Background="LightGray" Width="600" Height="500"/>
+    <ContentControl Grid.Column="1" Grid.Row="0" Grid.RowSpan="2" 
+                    Content="{Binding #shapes.SelectedItem, Mode=OneWay}"
+                    HorizontalContentAlignment="Stretch" />
+    <controls:LayerCanvas Grid.Column="2" Grid.Row="0" Grid.RowSpan="2" 
+                          Name="layerCanvas" Background="LightGray"
+                          Width="600" Height="500" />
   </Grid>
 </UserControl>
-