Fix ArgumentNullException when Expander is expanded, and Theme is Changed #10086
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Fixes microsoft/WPF-Samples#672
Description
Tag Property wasn't being used, and this was causing ArgumentNullException when the Expander was expanded, and the Theme was changed.
Customer Impact
Not taking this fix would cause a ArgumentNullException when the Expander is expanded, and the Theme is changed
Regression
Testing
Sample App Testing
Risk
Low
Microsoft Reviewers: Open in CodeFlow