C# WPF DataGrid ScrollIntoView not working with touch

Question

I try to scroll to the last selected item in a WPF DataGrid on the Loaded event. The DataGrid sits in a Tab. Everything is working when I test it in a normal Windows environment. But as soon as I touch the TabPage on a tablet instead of clicking it, it doesn't scroll to my last selected item. This is my code so far:

private void dataGrid_Loaded(object sender, RoutedEventArgs e)
{
    var currentItem = dataGrid.SelectedItem;

    dataGrid.ItemsSource = sh.GetDataTable(<SQL Select statement>).DefaultView;

    if (!(currentItem == null))
    {
        dataGrid.ScrollIntoView(currentItem);
    }
}

I've also tried the solution I found here but it didn't work.

Edit:

For testing purposes I completely removed the dataGrid_Loaded event. Now I'm only loading data into the DataGrid at the start of the program. Even now it keeps the scroll position when I switch between tabs with mouse clicks but not with touch! Is this a bug in the .NET Framework?

Answer 1

With the help of the MSDN Community I was able to solve the problem.

I had to scroll to the end of the DataGrid, do a UpdateLayout() and then scroll to the Item I want. Additionally I can't just set the ItemsSource every time because then the Item I saved before is not a valid Item of the DataGrid anymore.

So finally my dataGrid_Loaded method looks like this:

private void dataGrid_Loaded(object sender, RoutedEventArgs e)
{
    object currentPos = dataGrid.SelectedItem;

    if (dataGrid.ItemsSource == null)
    {
        dataGrid.ItemsSource = sh.GetDataTable("<SQL query>").DefaultView;
    }
    else
    {
        dataGrid.Items.Refresh();
    }

    if (currentPos != null)
    {
        dataGrid.ScrollIntoView(dataGrid.Items[dataGrid.Items.Count - 1]);
        dataGrid.UpdateLayout();
        dataGrid.ScrollIntoView(currentPos);
    }
}

I hope this will help someone else who has the same problem.

For reference here is my german MSDN thread in which my problem was solved.