Update view after update bind property in ViewModel

[mosflex]

Hi,
I'm updating my view by editing the binding value from ViewModel. When I push a button, I want to run an activityIndicator, but nothing appears.

<ActivityIndicator IsRunning="{Binding IsRunning}" IsVisible="{Binding IsRunning}" />
public bool IsRunning { get => isRunning; set { isRunning = value; RaisePropertyChanged(); } }

The RaisePropertyChanged() is called.
It works well if I put Task.Delay(1) after updating IsRunning but It's not clean.