/// <summary>
/// Updates the ContextMenu's Horizontal/VerticalOffset properties to keep it under the SplitButton.
/// </summary>
private void UpdateContextMenuOffsets()
{
// Calculate desired offset to put the ContextMenu below and left-aligned to the Button
#if SILVERLIGHT
Point currentOffset = _contextMenuInitialOffset;
Point desiredOffset = TransformToVisual(Application.Current.RootVisual).Transform(new Point(0, ActualHeight));
#else
Point currentOffset = new Point();
Point desiredOffset = _contextMenuInitialOffset;
#endif
_contextMenu.HorizontalOffset = desiredOffset.X - currentOffset.X;
_contextMenu.VerticalOffset = desiredOffset.Y - currentOffset.Y;
// Adjust for RTL
if (FlowDirection.RightToLeft == FlowDirection)
{
#if SILVERLIGHT
_contextMenu.UpdateLayout();
_contextMenu.HorizontalOffset -= _contextMenu.ActualWidth;
#else
_contextMenu.HorizontalOffset *= -1;
#endif
}
}
