private static bool LoadVirtualizedRows(ContentPresenter content, int rowCount)
{
DataGrid dg;
if (!content.TryFindChild<DataGrid>(out dg)) return false;
if (dg == null) return false;
if (dg.Items.Count == 0) return false;
if (!dg.EnableRowVirtualization) return false;
dg.EnableRowVirtualization = false;
dg.EnableColumnVirtualization = false;
VirtualizingPanel.SetIsVirtualizing(dg, false);
for (int i = 0; i < dg.Items.Count; i++)
{
dg.ScrollIntoView(dg.Items[i]);
if (i == rowCount) break;
}
dg.ScrollIntoView(dg.Items[0]);
return true;
}