Why a form is still visible after a FormClosed event is raised? How to detect when a form is actually closed? Interesting part is that _form2.VisibleChanged += (s, a) => { if (_form2.Visible == false) MessageBox.Show("TEXT"); }; leads to the same result.

Form closed but visible

Why a form is still visible after a FormClosed event is raised? How to detect when a form is actually closed?

enter image description here

Interesting part is that

_form2.VisibleChanged += (s, a) => 
{ 
    if (_form2.Visible == false) 
        MessageBox.Show("TEXT"); 
};

leads to the same result.