Pressing the Enter key when a field editor is focused will scroll the vertical scrollbar to the topmost offset. This is reproducible when the properties are grouped. Also, the RenderMode should be set to Flat.

To work this around, change the RenderMode setting to Hierarchical right before the Enter key logic is executed and then return it back to Flat after some time.

private void RadPropertyGrid_PreviewKeyDown(object sender, System.Windows.Input.KeyEventArgs e)
{
    var propertyGrid = (RadPropertyGrid)sender;
    var currentMode = propertyGrid1.RenderMode;
    propertyGrid.RenderMode = RenderMode.Hierarchical;

    Dispatcher.BeginInvoke(new Action(() =>
    {
        propertyGrid.RenderMode = currentMode;
    }));
}

The reason for the flickering is the group needs to be recreated so that its content to be updated.

BindingMode is OneWay when there is editor template and PropertySetMode is None

Resolved with LIB version 2014.1.407.

SearchTextBox is clipped, when SortAndGroupButtonsVisibility property of RadPropertyGrid is set to Collapsed, in Windows8Touch theme

Fixed with LIB version 2015.2.817.

The fix is available with lib version 2015.2.907.

The problem should be resolved with R2 2016. 

 Provide a straight-forward option for customers to set their custom tooltip. An example showing how to achieve this now is available at https://github.com/telerik/xaml-sdk/tree/master/PropertyGrid/CustomHyperlinkToolTip