Window.Margin & Window.Padding don't work - wpf

Question

I am setting peroperty Margin and Padding of a window and it doesn't take effect:
Here is an example:
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
SizeToContent="WidthAndHeight"
ResizeMode="NoResize"
Padding="22"
Margin="22">
<Grid>
<Label
FontWeight="Bold"
FontSize="36"
BorderThickness="1"
BorderBrush="Red"
Content="Hello world!"/>
</Grid>
</Window>
Result:
The desired result is that the red frame of the lable should be away 44px from the window's frame (margin+padding).
Yes, I know I can set the margin of the label, but that's not what I want.
I have a whole project that all its windows are set to a style, I want to set this properties (or other) in the general window style.
I guess if I won't find any solution I will create a named style for greed where I will set the margin/padding, then I will go Window by window and set the Grid's style, but that's the last option I wanna do.
Thanks in advance.

Answer 1

It's not surprising that Margin doesn't work, because Margin is the amount of space to be placed around the control. For a Window, this would mean making the frame smaller (and offset), not the client area, and that would be a bit strange (and might not play nicely with the Win32 hosting environment, not sure). It is a bit surprising that Padding doesn't work, and I'm not sure why that would be.
However, there is a workaround which you can encapsulate in a style: replace the default Window ControlTemplate with your own template that does respect the Padding:
<ControlTemplate TargetType="Window">
<Border Background="White" Padding="{TemplateBinding Padding}">
<ContentPresenter />
</Border>
</ControlTemplate>
(You would probably want the Border Background to be the dynamic window background brush for production code, but you get the idea.)
Obviously you can put this template in a style Template setter so as to avoid having to repeat it on each Window.
Here is the full template (generated with Microsoft Expression):
<Style x:Key="WindowStyle" TargetType="{x:Type Window}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Window}">
<Border Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
Margin="{TemplateBinding Margin}"
Padding="{TemplateBinding Padding}">
<AdornerDecorator>
<ContentPresenter/>
</AdornerDecorator>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="ResizeMode" Value="CanResizeWithGrip">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Window}">
<Border Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}">
<Grid>
<AdornerDecorator>
<ContentPresenter/>
</AdornerDecorator>
<ResizeGrip
x:Name="WindowResizeGrip"
HorizontalAlignment="Right"
VerticalAlignment="Bottom"
IsTabStop="false"
Visibility="Collapsed"
/>
</Grid>
</Border>
<ControlTemplate.Triggers>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition
Property="ResizeMode"
Value="CanResizeWithGrip"
/>
<Condition
Property="WindowState"
Value="Normal"
/>
</MultiTrigger.Conditions>
<Setter
Property="Visibility"
TargetName="WindowResizeGrip"
Value="Visible"/>
</MultiTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Trigger>
</Style.Triggers>
</Style>

Answer 2

Here's a simple alternative: just set a background colour on your Window and the Margin on the Grid within your Window: