BackstageTabItem Is Never Deselected if BackstageTabControl is not Logical Parent

[dartt]

It seems that if a BackstageTabItem is not defined directly in the XAML, it will not be deselected when another BackstageTabItem is selected and the SelectedContent of the BackstageTabControl will not be updated.

It looks like this is because the parent BackstageTabControl is found by calling container.Parent in BackstageTabItem.OnIsSelectedChanged, which will only get the logical parent.

If the BackstageTabItem was created by DataTemplate, it won't have a logical parent, and this will return null.

It may be that this just needs to change from container.Parent to this.TabControlParent (which seems to get the parent control from the visual tree rather than the logical tree).

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Environment

• Fluent.Ribbon v5.0.1
• Windows 10
• .NET Framework 4.5