Note that RadToolTip is a derivative of the standard MS ToolTip. Hence, its rendering does not support our html-like rendering. If you need to display html text, the suitable approach is to use our screen-tips as discussed before. They represent a more advanced version of tool-tips that offer easier customization and html-like text formatting: https://docs.telerik.com/devtools/winforms/telerik-presentation-framework/tooltips-and-screentips/screen-tips
private void radButton1_ScreenTipNeeded(object sender, ScreenTipNeededEventArgs e)
if (screenTip == null)
screenTip = new Telerik.WinControls.UI.RadOffice2007ScreenTipElement();
screenTip.CaptionLabel.Text = "<html><color=red>Hello";
screenTip.MainTextLabel.Text = "<html>Once <b> upon </b> a time";
this.radButton1.ButtonElement.ScreenTip = screenTip;
I hope this information helps. If you need any further assistance please don't hesitate to contact me.
Dess | Tech Support Engineer, Sr.
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