RowIsExpandedChanged called before child-elements exist

[marc]

{
    ...
    grid.RowIsExpandedChanged += new EventHandler<RowEventArgs>(grid_RowIsExpandedChanged);
}


void grid_RowIsExpandedChanged(object sender, RowEventArgs e)
{
    RadGridView cur = sender as RadGridView;
    IList<RadGridView> subgridlist = cur.ChildrenOfType<RadGridView>();
    for (int i = 0; i < subgridlist.Count; i++)
    {
        ...
    }
}

Using RadGridView I wanted to edit the child-elements when the hirarchy is expanded. In my case another RadGridView. The child element is not existant when the hirarchy is opened, but it's there when I close it again. So I assume the RowIsExpandedChanged Event fired before generating the controls. Is there a way for me to access the child elements when the hirarchy has been loaded, e.g. "RowIsExpandedLoaded"?