message: Fix right gridsplitter behavior (win)
diff: <RowDefinition Height="*"></RowDefinition>
  </Grid.RowDefinitions>
  <Grid.ColumnDefinitions>
  - <ColumnDefinition Width="55" Name="HoursColumn"></ColumnDefinition>
  - <ColumnDefinition Width="*" Name="TimeEntryColumn"></ColumnDefinition>
  - <ColumnDefinition Width="70" Name="ActivityColumn"></ColumnDefinition>
  + <ColumnDefinition Width="{Binding ElementName=HoursColumn, Path=Width}" MinWidth="40"/>
  + <ColumnDefinition Width="{Binding ElementName=TimeEntryColumn, Path=Width}"/>
  + <ColumnDefinition Width="{Binding ElementName=ActivityColumn, Path=Width}" MinWidth="45" MaxWidth="200"/>
  </Grid.ColumnDefinitions>
  <StackPanel Orientation="Horizontal" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="3">
  <mah:ToggleSwitch Margin="10 14 0 0"
  <RowDefinition Height="*"/>
  </Grid.RowDefinitions>
  <Grid.ColumnDefinitions>
  - <ColumnDefinition Width="{Binding ElementName=HoursColumn, Path=Width}"/>
  - <ColumnDefinition Width="Auto"/>
  - <ColumnDefinition Width="{Binding ElementName=TimeEntryColumn, Path=Width}"/>
  - <ColumnDefinition Width="Auto"/>
  - <ColumnDefinition Width="{Binding ElementName=ActivityColumn, Path=Width}"/>
  + <ColumnDefinition Width="55" MinWidth="40" Name="HoursColumn"/>
  + <ColumnDefinition Width="1"/>
  + <ColumnDefinition Width="*" MinWidth="60" Name="TimeEntryColumn"/>
  + <ColumnDefinition Width="1"/>
  + <ColumnDefinition Width="70" MinWidth="45" MaxWidth="200" Name="ActivityColumn"/>
  </Grid.ColumnDefinitions>
  <ItemsControl ItemsSource="{Binding HourViews}" AlternationCount="2" Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="5"
  x:Name="HoursItemsControl">
  </Style>
  </ItemsControl.ItemContainerStyle>
  </ItemsControl>
  - <GridSplitter Grid.Column="3" Grid.Row="1" Width="1">
  + <GridSplitter Grid.Column="3" Grid.Row="1" Width="1" HorizontalAlignment="Center" VerticalAlignment="Stretch">
  <GridSplitter.Style>
  <Style TargetType="{x:Type GridSplitter}">
  <Setter Property="Template">
  