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1. Add a SearchBar to a Xamarin.Forms app
2. Bind the SearchCommand to a Command.
3. Set the Command's CanExecute to always return false.
4. Run the app and issue a search result - the Command is invoked.
Because the Command.CanExecute is returning false, the Command should not be invoked. In addition, the SearchBar should wire up to the CanExecuteChanged handler and properly enable and disable the search bar in the native platform as it changes.
Should be fixed in 2.2.0-pre1
I have checked this issue with X.F 2.2.0-pre4 and its working fine. To reproduce and verify this issue I have used sample project.
Hence closing this issue.