There are many ways to do that.

Can you make a list of your guids and display value for each of them? If that's the case, I think using a value list is the simplest approach.

var list = grid.DisplayLayout.ValueLists.Add();

list.ValueListItems.Add(value, name);

column.ValueList = list

 But when I set the value into the cell with a GUID, and populate the valuelist, will the grid show the display name and not the value(guid) automatically?

Just set ValueList = bindableValueList

 It's in correct order. key first value second

Is the the appropriate way to use the BindableValueList :

 _grid.DisplayLayout.Bands[ChildBandRowKey].Columns[columnKey].ValueList = bindableValueList.ValueListItems.ValueList;

It doesn't seem to work ... I prolly got it wrong

That's strange... Make sure you put the value and text in the correct order.

About showing employee or crew, get two lists of employees and crew and add all values to the value list. You can also use a BindableValueList so you can skip the manual values insert.

 I tried using the valuelist. When the combo shows, it shows the name of the employee for example, but when the employee is selected, it shows the GUID in the grid .....