[الشاكي لله]

شكله بغ في الفيجوال ستوديو:

جرب القيام بالتالي : 

1. Close your XAML files.
   
   
2. Clean your Solution.
   
   
3. Close Visual Studio.
   
   
4. Restart your PC. Yes, this seems like overkill, but it was part of worked, so I'm including it.
   
   
5. Re-open your solution and rebuild.
   
   
6. Re-open your XAML file and the problem should be fixed.
   

وايضا public object UserSelectedValue
 يجب ان يكون
 public int UserSelectedValue