Watch out for multiple subscriptions with BindCommand to event in RxUI

When using the handy binding methods in ReactiveUI, you might find yourself using the very handy overload of BindCommand() which let's you bind a command to an event: this.BindCommand(ViewModel, vm => vm.MyCommand, v => v.TextBox, nameof(TextBox.GotFocus)); You might even have it inside a WhenActivated(…