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[TemplatePart(Name="PART_Dragger", Type=typeof(UIElement)), TemplatePart(Name="PART_ResizeGrip", Type=typeof(ResizeGrip))]
public class ToolWindow : HeaderedContentControl					

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<DataTemplate x:Key="header">
  <TextBlock Text="{Binding}" Background="DarkRed" 
    Foreground="White" FontSize="16" FontWeight="Bold" 
           Width="150" Height="20" TextWrapping="Wrap"/>
</DataTemplate>
<DataTemplate x:Key="content">
  <TextBlock Text="{Binding}" Background="Silver" Opacity="0.7" 
    Foreground="DarkRed" FontSize="12" FontWeight="Normal" 
    Width="150" Height="60" TextWrapping="Wrap"/>
</DataTemplate>

<Style x:Key="HeaderedContentControl"
  TargetType="{x:Type HeaderedContentControl}">
  <Setter Property="Template">
         <Setter.Value>
      <ControlTemplate TargetType="{x:Type HeaderedContentControl}">
        <StackPanel>
          <ContentPresenter ContentSource="Header"/>
          <ContentPresenter ContentSource="Content"/>
        </StackPanel>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>

...

<HeaderedContentControl Name="myControl" Header="Window 1" 
  HeaderTemplate="{StaticResource header}"
  Canvas.Top="10" Canvas.Left="20"
  AllowDrop="True" 
  MouseDown="control_MouseDown"
  MouseMove="control_MouseMove"
  MouseUp="control_MouseUp">
  <ContentControl Name="myContent" Content="This is the content of window 1."
    ContentTemplate="{StaticResource content}"/>
</HeaderedContentControl>