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                                    When a group in the dxDataGrid is first time collapsed, after it was expanded, an exception is thrown:
                                    System.ArgumentOutOfRangeException: 'Index was out of range. Must be non-negative and less than the size of the collection.
                                    Arg_ParamName_Name'.
                                    After that the grid expands the first group, instead of the one the user clicked on.

                                    I will attach the video and the test project to fully explain my problem.

                                • Alexey Lukinov 07.21.2019

                                  Video

                                • Alexey Lukinov 07.21.2019

                                  Project

                                • Konstantin (DevExpress) 07.22.2019

                                  Hello Alexey,

                                  I have reproduced the issue. We are researching its cause. I will inform you of our progress once we make any. Please stay tuned.

                                1 Solution

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                                • Alexey Lukinov 08.27.2019

                                  Good day.
                                  Unfortunately, the problem is not completely solved, just only for the top level grouping.
                                  If you make grouping by two or more columns, the error is still reproduced.

                                • Alexey Lukinov 08.27.2019

                                  Video

                                • Alexey Lukinov 08.27.2019

                                  Project

                                • Lena (DevExpress Support) 08.27.2019

                                  Hello,

                                  I installed a hotfix, launched your project, performed steps from your video, but was not able to reproduce the issue - DataGrid works fine and doesn't raise an exception. Please double-check your project and let me know your results.

                                • Alexey Lukinov 08.28.2019

                                  Really. I downloaded the project from this site back to my computer in a new directory, launched .... and everything works as it should.
                                  But in both projects that were on the hard drive and updated to the same version, the error is still reproduced, as it shown in the video.
                                  What could it be? And how do I get the main project to work the same?

                                • Alexey Lukinov 08.28.2019

                                  And I found another weird behavior:
                                  When grouped data lasts to the next grid page, it affect the data from previous groups.

                                • Alexey Lukinov 08.28.2019

                                  Video

                                • Lena (DevExpress Support) 08.28.2019

                                  Hello Alexey,

                                  And how do I get the main project to work the same?

                                  I suggest you remove the DevExtreme library from your PC and install the hotfix again. Please try it and let me know your results.

                                  As for the second issue, I've created a separate ticket on your behalf (T810337: DataGrid displays data from other groups when paging is enabled). It has been placed in our processing queue and will be answered shortly.