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Using an SfButton derived control when loaded cause this binding error:

'IsInAccessibleTree' property not found on 'UI.CustomControls.CustomButton', target property: 'Syncfusion.XForms.Buttons.TouchEffect.IsInAccessibleTree'

'Name' property not found on 'UI.CustomControls.CustomButton', target property: 'Syncfusion.XForms.Buttons.TouchEffect.Name'

Here you can find a sample project with the smallest implementation of the custom button.
Just run for see the error in output window.

Note: for the tracking of binding error I've used following row in App.OnInitialized method.

Xamarin.Forms.Internals.Log.Listeners.Add(new Xamarin.Forms.Internals.DelegateLogListener((arg1, arg2) => System.Diagnostics.Debug.WriteLine(arg2)));