On button hover, enable ResizeMode - wpf

Question

I am trying to make window frame appear when user hovers "mybutton". This should work but for some reason it is not. What am I missing?
<Window x:Class="test2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525" WindowStyle="None" Loaded="ShellWindow_SourceInitialized" x:Name="mywindow">
<Window.Resources>
<Style TargetType="{x:Type Window}">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=IsMouseOver, ElementName=mybutton}" Value="True">
<Setter Property="ResizeMode" Value="CanResize" />
</DataTrigger>
<DataTrigger Binding="{Binding Path=IsMouseOver, ElementName=mybutton}" Value="False">
<Setter Property="ResizeMode" Value="NoResize" />
</DataTrigger>
</Style.Triggers>
</Style>
</Window.Resources>
<Grid Name="mygrid" Loaded="Grid_Loaded">
<Button Name="mybutton" Content="Button" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75"/>
</Grid>
(In case you are wondering what those "Loaded" functions are, they remove chrome while keeping the shadow and allowtransparency=false
http://marcin.floryan.pl/blog/2010/08/wpf-drop-shadow-with-windows-dwm-api)
At the end it will not be button but will react on whole window border (I can not find better way to enable resizing while removing all chrome)

Answer 1

In the style TargetType should be MainWindow
<Style TargetType="{x:Type local:MainWindow}">
where local has to be mapped to your namespace:
xmlns:local="clr-namespace:test2"

Answer 2

myButton is defined after style. XAML parser is not that smart. User the following XAML to get your intended behavior:
<Window x:Class="test2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525" WindowStyle="None" Loaded="ShellWindow_SourceInitialized" x:Name="mywindow">
<Grid Name="mygrid" Loaded="Grid_Loaded" >
<Button Name="mybutton" Content="Button" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75"/>
</Grid>
<Window.Style>
<Style TargetType="{x:Type Window}">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=IsMouseOver, ElementName=mybutton}" Value="True">
<Setter Property="ResizeMode" Value="CanResize" />
</DataTrigger>
<DataTrigger Binding="{Binding Path=IsMouseOver, ElementName=mybutton}" Value="False">
<Setter Property="ResizeMode" Value="NoResize" />
</DataTrigger>
</Style.Triggers>
</Style>
</Window.Style>
</Window>