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Our company also needed this, so I solved this by creating a custom CellEditor, that looks like a ComboBox, but the dropdown control is not a list but a grid.
This is not an easy solution to develop. I had to create a control with an embedded TextBox and a Button. When the button is pressed, a form (with no border and title) is displayed on top of everything. That form contains an Xceed.Grid.GridControl. I then catch the CurrentRowChanged-event and change the value of the editor.
Imported from legacy forums. Posted by Tommy (had 3152 views)