RadGridView in a RadTabControl: gridlines not visible

[Ludwig]

If I use a GridView without TabControl, it is displayed fine:

<telerikgridview:RadGridView IsReadOnly="True" AutoGenerateColumns="False" ItemsSource="{Binding SelectedPatient.Weighings}" ShowGroupPanel="False" RowIndicatorVisibility="Collapsed">
    <telerikgridview:RadGridView.Columns>
        <telerikgridview:GridViewDataColumn DataMemberBinding="{Binding WeightDate}" Header="{lex:LocText S3.ParametersUE.PatientManagement:UIStrings:PatientDetailsView_GridWeighingsHeaderDate}" DataFormatString="{}{0:d}"/>
        <telerikgridview:GridViewDataColumn DataMemberBinding="{Binding Weight}" Header="{lex:LocText S3.ParametersUE.PatientManagement:UIStrings:PatientDetailsView_GridWeighingsHeaderWeight}"/>
    </telerikgridview:RadGridView.Columns>
</telerikgridview:RadGridView>

However, if I put it in a RadTabItem of a RadTabControl, not all horizontal gridlines are visible.

If I set ShowGroupPanel of the grid to True, all gridlines are visible!

Is there a drawing problem in the RadTabControl?

Edit: if i try a regular .NET TabControl, it has the same issue! So maybe it's a GridView issue...
Edit 2: if I set ShowColumnHeaders to False, all lines are visible

[Maya]

Hi Ludwig,

I have tried to reproduce the scenario you described, but still without any success. May you take a look at the sample attached and verify whether it corresponds to your settings and requirements ?
 

All the best,
Maya
the Telerik team