How to Set the SiteMapNode Title Dynamically from Master Page ? ASP.NET

[GFX010]

In My Web.sitemap I have the following:

<siteMapNode url="~/Groups/ViewGroups.aspx" urlRoute="groups/{PostId}/{PostTitle}" />
</siteMapNode>

In my MasterPage I have implemented the ItemDataBound event to try and set the title of each page that implements the master page dynamically but for some reason the title is not being set.

protected void SiteMapPath1_ItemDataBound(object sender, SiteMapNodeItemEventArgs e)
{
    string CurrentNodeTitle = GetTitleFromDatabase();

    if (e.Item.ItemType == SiteMapNodeItemType.Current) {
         e.Item.SiteMapNode.Title = CurrentNodeTitle;
    }
}

If I set the title in the Web.sitemap then it works perfectly but when I set it using e.Item.SiteMapNode.Title = CurrentNodeTitle; the title is nto being set.

[GFX010]

So there is no solution to this?