I resolve my problem, 

public class PanelUC : UltraPanel

{
    #region Constructor

    public PannelUC()
    {
         this.Dock = System.Windows.Forms.DockStyle.Fill;
         this.AutoScroll = true;
         this.Scroll += new System.Windows.Forms.ScrollEventHandler(PanneauUC_Scroll);
     }

     #endregion

     #region Événements

     private void PannelUC_Scroll(object sender, System.Windows.Forms.ScrollEventArgs e)
     {
           if (e.ScrollOrientation == ScrollOrientation.VerticalScroll)
                this.VerticalScrollProperties.Value = e.NewValue;
           else if (e.ScrollOrientation == ScrollOrientation.HorizontalScroll)
                this.HorizontalScrollProperties.Value = e.NewValue;
     } 

     #endregion
}

Now my panel scroll when i move de scroll cursor. Not just when i release mouse button.

Hello,

I am checking about the progress of this issue. Please let me know If you need any further assistance on this.     

Hello,

Thank you for the clarifications. The scrolling behaviour, you are talking about, is the default one. I am not sure how were you able to achieve something else. Is there any chance that you are running some custom code or handling a scroll event?

Could you please try to attach, if possible, a small sample project, reproducing the above mentioned issue, I will be happy to take a look at it?