Display property expanded by default

Hi- Is there a way to specify that some properties should be expanded by default when displayed, so that the user doesn't have to click the expand + sign every time? Thanks.

There isn't an easy way to do this from "inside" the grid, but you can do it by calling a method after you set SelectedObject.  This would go something like this:

  public void ExpandAutoExpandProperties()
  {
    TreeListView tlv = grid.Template.FindName("PART_Grid", grid) as TreeListView;
    foreach (object item in tlv.Items)
    {
      Node node = ((PropertyGridRow)item).Node;
      if (node.Name == "MyExpandableProperty")
      {
        TreeListViewItem tlvi = (TreeListViewItem)(tlv.ItemContainerGenerator.ContainerFromItem(item));
        tlvi.IsExpanded = true;
      }
    }
  }

Notes:

I have omitted error handling.  This is quite important as the grid template is applied only during window load.  So if you call this from the window constructor, FindName will return null.  You would need to defer calling the method until, e.g. the Loaded event fires.  (There are ways around this but they involve subclassing the grid; let me know if you want more info.)

This only checks the top level for autoexpanding nodes.  If you want to autoexpand nodes further down the tree, you will need to recurse into tlvi.Items.

I already subclassed the grid from instructions in the Autosizing left column width post.  So I just used

TreeListView treeListView = GetTemplateChild("PART_Grid") as TreeListView;

Works great.  Thanks!