Hi Holger,
Thank you for reporting this behavior. As a workaround, we can manually access the RadDropDownElements and change the ToolTip text property depending on the current localization.
var fontGroup = ((ribbon.CommandTabs[0] as RibbonTab).Items[1] as RadRibbonBarGroup).Items[0] as RadRibbonBarButtonGroup;
var fontDropDownList = fontGroup.Items[0] as RadDropDownListElement;
fontDropDownList.ToolTipText = "aaaa";
var fontSizeGroup = ((ribbon.CommandTabs[0] as RibbonTab).Items[1] as RadRibbonBarGroup).Items[1] as RadRibbonBarButtonGroup;
var fontSizeDropDownList = fontSizeGroup.Items[1] as RadDropDownListElement;
fontSizeDropDownList.ToolTipText = "bbbbb";
Regards,
Dinko | Tech Support Engineer
Progress Telerik
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