/// <summary>
/// Add the spacing views into the indexed docker.
/// </summary>
/// <param name="i">Index of docker.</param>
/// <param name="spacerL">Spacer for the left side.</param>
/// <param name="spacerR">Spacer for the right side.</param>
protected override void AddSpacersToDocker(int i,
ViewLayoutMetricSpacer spacerL,
ViewLayoutMetricSpacer spacerR)
{
// Get the indexed instance
ViewDrawDocker viewDocker = _viewDockers[i];
// Add them into the view docker instance
viewDocker.Add(spacerL, ViewDockStyle.Left);
viewDocker.Add(spacerR, ViewDockStyle.Right);
}