/// <summary>
 /// Mark self as dirty and invoke the RefreshRequest event.
 /// </summary>
 /// <param name="rrt">Request type.</param>
 /// <param name="aus">Axis update status.</param>
 protected void Refresh(RefreshRequestType rrt, AxisUpdateState aus)
 {
     Dirty = true; RefreshRequest?.Invoke(this, new RefreshRequestEventArgs(rrt, aus, this));
 }
 /// <summary>
 /// Initialize.
 /// </summary>
 /// <param name="rrt">The request type.</param>
 /// <param name="aus">The axis update info.</param>
 /// <param name="cc">The component.</param>
 public RefreshRequestEventArgs(RefreshRequestType rrt, AxisUpdateState aus, ChartComponent cc)
 {
     this.Request   = rrt;
     this.Component = cc;
     this.Axis      = aus;
 }