public void RefreshCategoryTree()
{
CategoryTree.BeginInit();
CategoryTree.Items.Clear();
foreach (var pg in SettingsPages)
{
CategoryTree.Items.Add(_BuildCategoryNode(pg));
}
// If nothing selected and page control empty, select first item
if (PropPageHost.Content == null && CategoryTree.Items.Count > 0)
{
SetSettingPage(CategoryTree.Items[0] as TreeViewItem);
}
CategoryTree.EndInit();
}