The "InvalidOperationException: Cannot set OverridesDefaultStyle property in the default Style." exception is thrown at design time when the LightGray theme is used

hi , since instalation of the hot fix, i have a probleme with this declaration  "dxg:GroupValueMarginConverter" in :
<dxg:GridControl.View>
               <dxg:TableView IndicatorWidth="0" AllowEditing="False" Name="TableView1" BestFitArea="Rows"
                              BestFitMode="AllRows" ShowFixedTotalSummary="True" ShowTotalSummary="false"
                              ShowGroupedColumns="True" NavigationStyle="Cell" >

<dxg:TableView.GroupRowTemplate >
                       <DataTemplate >
                           <dx:MeasurePixelSnapper>
                               <dxg:GroupGridRowContent x:Name="PART_GroupRowContent" Style="{Binding Path=View.GroupRowStyle}">
                                   <dx:DXDockPanel>
                                       <dxg:GridGroupExpandButton x:Name="Toggle" Margin="5,2,0,3" VerticalAlignment="Center" IsChecked="{Binding Path=IsRowExpanded}" Command="{Binding View.Commands.ChangeGroupExpanded}" CommandParameter="{Binding RowHandle.Value}" />
                                       <dxg:GroupValueContentPresenter Content="{Binding Path=GroupValue}" ContentTemplateSelector="{Binding Path=Content.Column.ActualGroupValueTemplateSelector, RelativeSource={RelativeSource Self}}">
                                           <dxg:GroupValueContentPresenter.Margin>
                                               <Binding Path="View.DataControl.BandsLayout">
                                                   <Binding.Converter>
                                                       <dxg:GroupValueMarginConverter NormalMargin="0,2,0,3" BandedMargin="5,2,20,3"/>
                                                    </Binding.Converter>
                                               </Binding>
                                           </dxg:GroupValueContentPresenter.Margin>
                                       </dxg:GroupValueContentPresenter>
                                       <dxg:GroupSummaryContainer dxg:RowData.CurrentRowData="{Binding}" Name="PART_GroupSummaryPlaceHolder" HorizontalAlignment="Left" Margin="10 0 0 0"/>
                                   </dx:DXDockPanel>
                               </dxg:GroupGridRowContent>
                           </dx:MeasurePixelSnapper>
                       </DataTemplate>
                   </dxg:TableView.GroupRowTemplate>
               </dxg:TableView>
           </dxg:GridControl.View>
The error : "type dxg:GroupValueMarginConverter is missing…"
Note : I was on 13.2.9 before update to the hot fix.
Any idea ?

Indeed, we removed the GroupValueMarginConverter class in version 14.2. I suggest you update your GroupRowTemplate according to the current structure. I have attached the default template to this comment - please take a moment to review it.
If you face difficulties implementing the required behavior, feel free to contact us.

I'm sorry but even with the hotfix, cyclic error continues to appear ( see error in attachement)

Hi Jean,
I have also reproduced an exception with Gabriel's project, but it has a different callstack - see the attached screencast. Since this issue can be unrelated to the original one, I have created a separate report about it - T210696.
Would you please send us a sample where the exception you faced can be reproduced? This would be extremely helpful for us.

I'm sorry but i can't send you a sample. My project is so bigger and i never can reproduce the error separatly. the error come sometimes at end user using program.
i haven't context or way to reproduce this error …

Hello,

Would you please check whether the issue occurs only on a machine with the same settings? Try to collect information about the client machine environment (OS, .NET Framework version, etc.). We can create a separate private ticket, and only you and our team will have access to it. There you can share your project. Another way is to upload your project to our ftp server:

Server:               ftp.devexpress.com
User:                UPLOAD
Password:      HEREYOUARE

This will help us reproduce the issue on our side and suggest a more suitable solution. We are looking forward to your response.

Thanks,
Andrey

Do you know if the hotfix "DevExpressComponents-14.2.5.15062.exe" (post at this page: https://www.devexpress.com/Support/Center/Question/Details/T211496)  contain the "DevExpressComponents-14.1.9.15037.exe" corrections ? because if it's case, the "cyclical exception" exist again…

Yes, the 14.2.5.15062 hotfix should include changes from 14.1.9.15037.
If you cannot send your working project, try to localize the issue on your side. For example, copy XAML from the problematic control to a clear sample. Do you see the issue in this case?

Version 15.2.4, I am getting this issue as well. Commenting out the style in the XAML lets you edit the WPF form.
InvalidOperationException: Cannot set OverridesDefaultStyle property in the default Style.

Hi Chris,

Would you please provide me with the code used to reproduce the exception? What style are you defining in xaml?

Thanks,
Alex