| name | uno-toolkit-ancestor-binding |
| description | Use AncestorBinding and ItemsControlBinding markup extensions for relative binding from within DataTemplates. Access parent DataContext. |
| when_to_use | Use when binding inside a `DataTemplate` needs to reach the outer `DataContext`, the page's ViewModel, or an ancestor `ItemsControl` — the Uno equivalent of WPF's `RelativeSource FindAncestor`. `ItemsControlBinding` exposes the parent ItemsControl's own `DataContext` from within its item template. |
| metadata | {"author":"uno-platform","version":"2.4","category":"toolkit"} |
Uno Toolkit AncestorBinding — Agent Skill
Workflow
Docs lookup: call uno_platform_docs_search(...) first, then uno_platform_docs_fetch(sourcePath="…") using the sourcePath field from a result (a relative .md path; add the result's anchor for a section). Never pass a URL, a .html link, or a hand-built path.
Step 1: Fetch the AncestorBinding Documentation
uno_platform_docs_search("Uno Toolkit AncestorBinding ItemsControlBinding relative binding DataTemplate ancestor")
Primary documentation page:
- AncestorBinding & ItemsControlBinding:
external/uno.toolkit.ui/doc/helpers/ancestor-itemscontrol-binding.md
Fetch the page:
uno_platform_docs_fetch(sourcePath="external/uno.toolkit.ui/doc/helpers/ancestor-itemscontrol-binding.md")
Key Principles (Stable)
{utu:AncestorBinding AncestorType=MyControl, Path=DataContext.MyProperty} — binds to an ancestor's DataContext{utu:ItemsControlBinding Path=DataContext.MyCommand} — shorthand for binding to the parent ItemsControl's DataContext- Similar to WPF's
{RelativeSource Mode=FindAncestor, AncestorType=...}
- Essential for commands in DataTemplates that need to call the page's ViewModel
- XAML namespace:
xmlns:utu="using:Uno.Toolkit.UI"
Related Skills
- [[uno-toolkit-command-extensions]] — Commands in templates
