by Fenton Webb
It’s possible to supply your own XAML Tooltips by supplying a loose WPF XAML file as the ContentSource
e.g.
<Header>
<FileReferences>
<ToolTipFileReferences>
<ContentSources>
<ContentSource>toolTips.xaml</ContentSource>
</ContentSources>
</ToolTipFileReferences>
</FileReferences>
</Header>
The ContentSource is actually a Uri which means you can use the Uri pack format to specify different paths or even XAML files packaged into your own resource DLLs…
e.g. a DLL Resource locator
<Header>
<FileReferences>
<ToolTipFileReferences>
<ContentSources>
<ContentSource>pack://application:,,,/MyApplicationDLL;resources/Tooltip.xaml</ContentSource>
</ContentSources>
</ToolTipFileReferences>
</FileReferences>
</Header>