private void RefreshTooltip()
{
ToolTip tip = new ToolTip();
tip.Content = RosterUtils.GetTooltip(riTo);
tip.Background = UiEnhancer.WhiteBrush;
tip.BorderBrush = UiEnhancer.DarkGrayBrush;
tip.BorderThickness = new Thickness(1);
tip.Placement = System.Windows.Controls.Primitives.PlacementMode.Right;
tip.PlacementTarget = PresenceGrid;
PresenceGrid.ToolTip = tip;
}
