WPF design question (Style set in app.xaml and is not overwritten when local set)

Question

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In my app.xaml, I have (beside other styles) the following:

XML

<Style x:Key="BasicStyle">
  <Setter Property="FrameworkElement.Margin" Value="3,1,3,1"></Setter>
</Style>

<Style TargetType="StackPanel" BasedOn="{StaticResource BasicStyle}"></Style>
<Style TargetType="DockPanel" BasedOn="{StaticResource BasicStyle}"></Style>

And I have a custom control with the following XAML:

XML

<UserControl x:Class="NeonMika.EightTracksPlayer.HeaderControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" Margin="0">
    <DockPanel Margin="0" removed="{StaticResource HeaderColor}">
        <DockPanel DockPanel.Dock="Top">
            <TextBlock FontWeight="ExtraBlack" FontSize="24" DockPanel.Dock="Right" HorizontalAlignment="Right" VerticalAlignment="Top">8tracksPlayer</TextBlock>
            <Image DockPanel.Dock="Left" Source="/NeonMika.EightTracksPlayer;component/Images/NeonMikaLogo.png" HorizontalAlignment="Left" Height="60" VerticalAlignment="Center"></Image>
        </DockPanel>
    </DockPanel>
</UserControl>

I have set Margin="0" on the UserControl _and_ on the DockPanel (to be sure they are).

But when I use this control like this

XML

<DockPanel VerticalAlignment="Stretch" Margin="0">
  <local:HeaderControl DockPanel.Dock="Top" Margin="0"></local:HeaderControl>
  <local:ControlArea DockPanel.Dock="Bottom" Margin="0">        </local:ControlArea>
  <ContentControl Name="ContentArea" Margin="0"></ContentControl>
</DockPanel>

there is still a Margin around my control. How is this possible? I sat every Margin to zero i could find :P

Thanks for your help!
Greets, Markus

Posted 27-Sep-12 5:45am

NeonMika

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NeonMika · Answer 1 · 2012-09-30T03:43:00

I found it out for myself (after a long way of trying and testing).
It's because the Window's template has a "built in" border.
Here is my way to solve it:
You change the Window's Template with your own ControlTemplate.
This ControlTemplate just contains a StackPanel with Margin=0 and other TemplateBindings (in my case, I only need the Background property:

<window.template>
  <controltemplate targettype="Window">
    <stackpanel margin="0" background="{TemplateBinding Background}">
      <contentpresenter></contentpresenter>
    </stackpanel>
  </controltemplate>
</window.template>

Probably this can help someone else too :)