/// <summary>
/// Raises the <see cref="UIElement.MouseDown"/> event.
/// </summary>
/// <param name="e">
/// The <see cref="MouseButtonEventArgs"/> instance containing the event data.
/// </param>
protected override void OnMouseDown(MouseButtonEventArgs e)
{
if (e == null)
{
throw new ArgumentNullException(nameof(e));
}
base.OnMouseDown(e);
if (e.Handled || _header == null || !_header.IsMouseOver)
{
return;
}
if (e.ChangedButton == MouseButton.Left || (e.ChangedButton == MouseButton.Right && !IsSelected))
{
e.Handled = true;
ParentTreeView?.MoveSelection(this);
}
}
