I'm creating a new application using the latest version (2024.1) of the Ultimate UI for WPF and have a problem with the XamRibbon.  The tab panel appears to have a background with some shading and I can't seem to find any way of removing this.  The screenshot below illustrates the problem.  This is a simple application with no ApplicationMenu and no Ribbon groups, just to illustrate the issue. 

In this example, I've used the following code:

<igWPF:RibbonWindowContentHost
    Background="White">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="144" />
            <!-- Ribbon Row -->
            <RowDefinition />
            <RowDefinition Height="30" />
        </Grid.RowDefinitions>
        <igRibbon:XamRibbon
            Theme="Office2013">
            <igRibbon:XamRibbon.ApplicationMenu>
                <igRibbon:ApplicationMenu />
            </igRibbon:XamRibbon.ApplicationMenu>
            <igRibbon:XamRibbon.QuickAccessToolbar>
                <igRibbon:QuickAccessToolbar Visibility="Collapsed" />
            </igRibbon:XamRibbon.QuickAccessToolbar>
        </igRibbon:XamRibbon>
    </Grid>
</igWPF:RibbonWindowContentHost>

In a previous project, using a version of the tools from 2022, I get a nice clean UI using exactly the same theme with no additional changes, as far as I can tell.

What's really odd is that the shaded background isn't visible in the designer in Visual Studio.

Has something changed?

How do I get the simple, clean layout that I want/need/had before?

Thanks, Andy

I can't upload the image...

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