Why do WindowEvents work but SolutionEvents and TextEditorEvents don't?

Question

I am going off the list here. I want to be notified when the solution or project changes. I started with this code and added to it.

    public void Watch()
    {
        DTE dte = Package.GetGlobalService(typeof(SDTE)) as DTE;
        dte.Events.SolutionEvents.Opened += SolutionEvents_Opened;
        dte.Events.TextEditorEvents.LineChanged += TextEditorEvents_LineChanged;
        dte.Events.WindowEvents.WindowMoved += WindowEvents_WindowMoved;
    }

    private void WindowEvents_WindowMoved(Window Window, int Top, int Left, int Width, int Height)
    {
        System.Windows.Forms.MessageBox.Show("1-->");
    }

    private void TextEditorEvents_LineChanged(TextPoint StartPoint, TextPoint EndPoint, int Hint)
    {
        System.Windows.Forms.MessageBox.Show("2-->");
    }

    private void SolutionEvents_Opened()
    {
        System.Windows.Forms.MessageBox.Show("3-->");
    }

But only WindowEvents_WindowMoved ever fires. Am I doing something wrong?