Hello Petar,

I had gone through the documentation link sent. Finally i wrote the coding successfully. Let me provide the code which may be useful for our members.

// Insert this line in the Form Load Event.

            ultraToolbarsManager1.CreationFilter = new class1();

// Add this class

    public partial class class1 : IUIElementCreationFilter
    {
        #region IUIElementCreationFilter Members
        public void AfterCreateChildElements(UIElement parent)
        {
          RibbonTabPageUIElement    ribbArea10 = parent as RibbonTabPageUIElement;

            if (ribbArea10 != null)
            {
                Rectangle newRect = new Rectangle(ribbArea10.Rect.X, ribbArea10.Rect.Y, 400, ribbArea10.Rect.Height);
                ribbArea10.Rect = newRect;
            }
        }
        public bool BeforeCreateChildElements(UIElement parent)
        {
            return false;
        }
        #endregion

}

The code above provided is for the reduction of the RibbonTab alone.

It can also be done for quickaccesstoobbar, tabitemtoolbar CaptionArea, CaptionButton by using the appropiate Uielement class at Italized point.

Once again Thankyou Petar for the Guidance Provided.