Hi maheshpanse,

You can handle ChartDrawItem event and to change position, width and height of any primitive drawn on the chart. You need Text and Box primitives in the case with Legend labels. Here's a sample how to change these parameters. Note that Box's Column property can contain -1 that describes external box of the legend.

        private void ultraChart1_ChartDrawItem(object sender, Infragistics.UltraChart.Shared.Events.ChartDrawItemEventArgs e)
        {
            int newBoxHeight = 25;
            // try if it is a Box primitive which belongs to legend and it is not the external legend's box           
            Box box = e.Primitive as Box;           
            if (box != null && !string.IsNullOrEmpty(box.Path) && box.Path.EndsWith("Legend") != false && box.Column != -1)
            {
                box.rect.Height = newBoxHeight;
                if (box.Column != 0)
                {
                    box.rect.Y = box.rect.Y + newBoxHeight * box.Column;
                }
            }
               
            Text text = e.Primitive as Text;
            // try if it is a Text primitive which belongs to legend and it is not the external legend's text
            if (text != null && !string.IsNullOrEmpty(text.Path) && text.Path.EndsWith("Legend") != false && text.Column != -1)
            {
                text.bounds.Y += 8; // increase according to newBoxHeight in order to center the text
                if (text.Column != 0)
                {
                    text.bounds.Y = text.bounds.Y + newBoxHeight * text.Column;
                }
            }

        }

Please add screen shot of the problem legend in the case this sample will not help you.