https://devexpress.github.io/dotnet-eud/interface-elements-for-desktop/articles/grid/data-presentation/group-grid-rows.html#group-data

https://devexpress.github.io/dotnet-eud/interface-elements-for-desktop/articles/grid/data-presentation/group-grid-rows.html#change-group-order

https://docs.devexpress.com/WindowsForms/114625/controls-and-libraries/data-grid/getting-started/walkthroughs/summaries/tutorial-group-summaries#enabling-and-using-the-group-summary-editor

https://devexpress.github.io/dotnet-eud/interface-elements-for-desktop/articles/grid/data-presentation/group-grid-rows.html#ungroup-data

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