Question

I want to use the TreeView.AfterCollapse Event in WPF .
Is there a Way to use it??
and why are not all Events supported in WPF?
Thank you

Answer 1

TreeViewItem has a Collapsed event which is equivalent to the AfterCollapsed event in Windows Forms. This event is initially raised by the TreeViewItem, not the TreeView, but since it’s a bubbling event, it is also raised on the TreeView afterwards, so you can handle it at this level if you need to. You can use the OriginalSource property to get the TreeViewItem that raised the event:

XAML

<TreeView TreeViewItem.Collapsed="TreeViewItem_Collapsed" ...>

Code-behind

private void TreeViewItem_Collapsed(object sender, RoutedEventArgs e)
{
    TreeViewItem tvi = (TreeViewItem)e.OriginalSource;
    ...
}