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The easiest approach in getting the RadPane instance by an element in it's TitleTemplate is to used the PaneHeader element of that template and use it's GetParentPane()
method. The next code snippet shows how the OnOpenHelpTooltip method from your code snippet should look like:
sender, ExecutedRoutedEventArgs e)
var btn = e.OriginalSource
var paneHeader = btn.ParentOfType<PaneHeader>();
var pane = paneHeader.GetParentPane();
Hope this is helpful.
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