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this.groupingGrid1.TableDescriptor.Columns["Column Name"].Appearance.AnyRecordFieldCell.CellType = "Image";
If you do want to display a pushbutton you could instead set the cell type to "PushButton". However, in order to display text in a pushbutton you will also need to override TableControlPrepareViewStyleInfo and assign e.Inner.Style.Description = e.Inner.Style.Text.
If you want a more customized cell type, e.g. similar to a Ellipsisbutton as shown in "Grid\Samples\CellButtons" example, you can create a custom cell type and register it with the grid. I can create a sample for that if this is the kind of solution you are interested in.
Let me know if you need more help.
Thanks,
Stefan