Hello Horst,

I have been investigating into the behavior you are reporting and at the moment, I cannot seem to reproduce the behavior you are seeing with a vanilla XamRibbonWindow on the page. Are you potentially applying any themes or styling to your window? If so, it is possible that you will need to include some default styles relating to the XamRibbonWindow in order to apply the same tooltips. Can you please provide some additional information on this?

Please let me know if you have any other questions or concerns on this matter.

<igRibbon:XamRibbonWindow
        xmlns="">schemas.microsoft.com/.../presentation"
        xmlns:x="">schemas.microsoft.com/.../xaml"
        xmlns:d="">schemas.microsoft.com/.../2008"
        xmlns:mc="">schemas.openxmlformats.org/.../2006"
        xmlns:local="clr-namespace:WpfApp13"
        xmlns:igRibbon="">infragistics.com/Ribbon" x:Class="WpfApp13.MainWindow"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <igRibbon:RibbonWindowContentHost>
        <igRibbon:XamRibbon Height="144" VerticalAlignment="Top">
            <igRibbon:XamRibbon.ApplicationMenu>
                <igRibbon:ApplicationMenu/>
            </igRibbon:XamRibbon.ApplicationMenu>
            <igRibbon:XamRibbon.QuickAccessToolbar>
                <igRibbon:QuickAccessToolbar/>
            </igRibbon:XamRibbon.QuickAccessToolbar>
        </igRibbon:XamRibbon>
    </igRibbon:RibbonWindowContentHost>
</igRibbon:XamRibbonWindow>

c#:

using Infragistics.Themes;
using Infragistics.Windows.Ribbon;

namespace WpfApp13
{
    /// <summary>
    /// Interaktionslogik für MainWindow.xaml
    /// </summary>
    public partial class MainWindow : XamRibbonWindow
    {
        public MainWindow()
        {
            ThemeManager.ApplicationTheme = new Office2013Theme();
            InitializeComponent();
        }
    }
}