Hi,               

You can use the ApplicationMenuButtonImage property and set a an image with the desired text.

Just for example:

            ultraToolbarsManager1.Style = Infragistics.Win.UltraWinToolbars.ToolbarStyle.ScenicRibbon;

            // emptySpace.png is used as a canvas for the text that will be drawn

            Image img = Image.FromFile(@"..\..\emptySpace.png");

            Bitmap b0 = new Bitmap(img, new Size(50, 20));

            using (Graphics g = Graphics.FromImage(b0))

            {

                g.DrawString("text", new Font("Arial", 10f), Brushes.Black, 0, 0);

            }

            ultraToolbarsManager1.Ribbon.ApplicationMenuButtonImage = b0;

Let me know if this works for you.       

Regards,

Stefaniya