private void _treeCtrl_AfterCheck(object sender, TreeViewEventArgs e)
{
// the built-in checkbox functionality of the TreeView control is not used because of a
// double clicking bug where the node's internal state is not in sync with what is being painted
// all checkbox support is now handled through the custom state image list
// ref: http://connect.microsoft.com/VisualStudio/feedback/details/374516/treeview-control-does-not-fire-events-reliably-when-double-clicking-on-checkbox
// ref: CC ticket #9233
}