Setting Margin, Width bound to ActualWidth on Controls causes VS2012 Crash

I was messing around with DataGrid headers and discovered something awkward. I toyed with it until I found the root cause in the XAML and built a small sample of how to reproduce.

I only tested this with textbox and datagrid, but I suspect it works with other controls as well. Setting the Margin property ( I set Margin="2") on either the datagrid or the textbox when their widths are bound to a sibling element through ActualWidth will cause my entire Visual Studio to stop responding almost immediately.

<Window x:Class="MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" SizeToContent="WidthAndHeight">

        <StackPanel Orientation="Vertical">
            <StackPanel Orientation="Horizontal" x:Name="panel">
                <TextBlock Text="Text:1" Width="90" />
                <TextBox Width="90" />
            </StackPanel>
            <DataGrid AutoGenerateColumns="False" Width="{Binding ActualWidth, ElementName=panel}">
                <DataGrid.Columns>
                    <DataGridTextColumn Header="Test" Width="*" />
                    <DataGridTextColumn Header="Test2" Width="*" />
                    <DataGridTextColumn Header="Test3" Width="*" />
                </DataGrid.Columns>
            </DataGrid>
            <TextBox Width="{Binding ActualWidth, ElementName=panel}"  />
        </StackPanel>
</Window>

This is what the design preview looks before it stops responding. The window stretches into "infinity" until what I suspect to be VS running out of memory.

Any idea what could be causing this?

Try set HorizontalAlignment="Left" (it does not matter what kind of alignment) for StackPanel:

<StackPanel x:Name="panel" Orientation="Horizontal" HorizontalAlignment="Left">
    <TextBlock Text="Text:1" Width="90" />
    <TextBox Width="90" />
</StackPanel>

At the panel width will be 180, and all the rest controls, this value will inherit from binding (DataGrid, TextBox).

Quote from StackPanel MSDN:

The default value is stretch for both HorizontalAlignment and VerticalAlignment of content that is contained in a StackPanel.

Since the default alignment NaN of panel, that panel settings Width and Height are inherited from parent - StackPanel, who also has no explicit parameters. And in this panel, the width and height inherits from the Window.