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0. Create Empty Wpf Project with only one SFSpreadsheet Control.
1. Create 3 sheets
2. Enter SheetName editing mode by click on names
3. While In edit mode, drag-drop sheet 3 to the first sheet (making sheet3, sheet1, sheet2 in order)
4. Repeat 2 and 3 (edit Sheet2 Name, drag drop while in edit mode to make it in front of sheet 3)
5. Exception thrown.
Tested multiple times and it reproduces. Test in debug mode.