How to save the IsExpanded state in group headers of a listview

Question

I have quite a tricky problem:

I am using a ListView control with the ItemsSource set to a CollectionViewSource including a PropertyGroupDescription to group the Lis

Answer 1

The marked Answer Doesn't work in .Net 4.5.

A simple solution for this is to add a

    private bool _isExpanded = true;
    public bool IsExpanded
    {
        get { return _isExpanded; }
        set { _isExpanded = value; }
    }

property to your ViewModel (In this case Whatever objects CurrentListViewData holds)

and then do:

on your template.

Simple and effective just like WPF should be