Binding with StringFormat doesn't work for tooltips
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- C#
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Description
* .NET Core Version: 3.0
* Windows version: 1803 (17763.437)
* Does the bug reproduce also in WPF for .NET Framework 4.8?: Yes
**Problem description:**
Probably an old bug: https://stackoverflow.com/questions/197095/wpf-binding-with-stringformat-doesnt-work-on-tooltips
**Actual behavior:**
StringFormat is ignored
```xaml
```
**Expected behavior:**
It should work.
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