Header, title, menu and icon templates

DockingManager exposes data templates that change how a content is presented in the docking chrome without replacing any control template. Each template has a matching ...TemplateSelector; a selector result that is not null wins, and a null result falls back to the template property.

Property (and selector)	Applies to	Data context
`DocumentHeaderTemplate`	Document tabs; document rows of the Ctrl+Tab navigator	the `LayoutDocument`
`AnchorableHeaderTemplate`	Tool tabs; auto-hide rail tabs; tool rows of the Ctrl+Tab navigator	the `LayoutAnchorable`
`DocumentTitleTemplate`	Floating document window caption	the `LayoutDocument`
`AnchorableTitleTemplate`	Tool pane title row; auto-hide flyout title; floating tool window caption	the `LayoutAnchorable`
`DocumentPaneMenuItemHeaderTemplate`	Rows of a document pane's open-documents list (the list button at the end of the tab strip)	the listed `LayoutContent`
`IconContentTemplate`	The icon of the default presentation in all of the above	the `IconSource` value

Default presentation

Without a header, title or menu template, each place shows the content's icon followed by its title. LayoutContent.IconSource is an ImageSource; the default icon is a 16x16 Image. When IconContentTemplate (or its selector) yields a template, that template presents the icon instead and receives the IconSource value as its data context, for example to tint, badge or resize it. A content without an icon shows its title only.

A header, title or menu template owns the whole presentation of its place, including any icon: bind IconSource inside the template to keep one.

Behavior

Open-documents rows remain standard ToggleMenuFlyoutItem controls, so the menu's keyboard focus, navigation and invocation apply unchanged. The selected content is checked (exposed through IsChecked and automation; the list draws no check mark), disabled contents are disabled, and a row activates its content only if it still belongs to the pane when invoked.
Navigator rows keep the list's selection and commit behavior; their content is still the LayoutItem that is selected. Replacing the navigator list's ItemTemplate or setting its ItemTemplateSelector restores full control of the row to that template.
Floating captions keep the caption text for the native window title and automation even while a title template is displayed. The caption remains a drag handle; templates in it are not hit-test targets.
Changing any of these properties re-renders the chrome on the next layout pass. DockingManager.Refresh() applies the change synchronously. The navigator and the open-documents list resolve templates each time they open.

Example

<dock:DockingManager
    DocumentPaneMenuItemHeaderTemplate="{StaticResource DocumentMenuRow}"
    IconContentTemplate="{StaticResource TabIcon}"
    AnchorableHeaderTemplate="{StaticResource ToolHeader}">
    <dock:DockingManager.Resources>
        <DataTemplate x:Key="DocumentMenuRow">
            <StackPanel Orientation="Horizontal" Spacing="8">
                <Image Source="{Binding IconSource}" Width="16" Height="16"/>
                <TextBlock Text="{Binding Title}"/>
                <TextBlock Text="{Binding Description}" Opacity="0.6"/>
            </StackPanel>
        </DataTemplate>
        <DataTemplate x:Key="TabIcon">
            <Image Source="{Binding}" Width="14" Height="14" Opacity="0.85"/>
        </DataTemplate>
        <DataTemplate x:Key="ToolHeader">
            <TextBlock Text="{Binding Title}" FontStyle="Italic"/>
        </DataTemplate>
    </dock:DockingManager.Resources>
    <layout:LayoutRoot>
        <layout:LayoutPanel>
            <layout:LayoutDocumentPane>
                <layout:LayoutDocument Title="Program.cs" ContentId="program"
                                       IconSource="ms-appx:///Assets/Icons/code.png"/>
            </layout:LayoutDocumentPane>
        </layout:LayoutPanel>
    </layout:LayoutRoot>
</dock:DockingManager>

Gallery

Docking and IDE workspace samples set IconSource on every document and tool (original 32x32 assets in samples/UnoDock.Gallery/Assets/Icons).
IDE workspace also sets DocumentPaneMenuItemHeaderTemplate, a custom AnchorableContextMenu whose rows bind the LayoutAnchorableItem commands, and NamedPaneLayoutStrategy, an ILayoutUpdateStrategy that places tools added with Layout > New tool window into the pane named WorkspaceTools.
XAML workbench declares DocumentPaneMenuItemHeaderTemplate and tool icons in compiled XAML.

The templates-icons desktop suite (tests/UnoDock.VisualTests/TemplateIconTests.cs) covers every row of the table above, the default presentation, selectors and runtime changes.