I was able to reproduce the reported problem in my local end.

The problem happen because IsEditing in ViewModel doesn't change to true when the view changed into edit mode. I got the expected result if modify my command (in the ViewModel) into the following:

public void ExecuteCustomCmd(object parameter)
{
    this.IsEditing = true;
    
    // do something in here
    //this.ToastPresenter.Show("hello world");
    
    this.IsEditing = false;
}

This problem is no longer persist in the experimental assembly of Crosslight. If it's okay for you, you can try to use my approach as workaround.

Hope this helps.

Hello Yudi,

your proposed workaround solves the problem.

Thanks,

Thomas