How would you solve for this use case using a TStringGrid?

[EganSolo]

You're asked to create a TStringGrid with two columns: Index and Name that must satisfy the following constraint: If the Index is even, the user can edit the name, but if it's odd, the user must pick a value from a pop-up window.

Which TStringGrid event(s) would you use to implement this functionality?

[Zvoni]

In OnSelectCell check if Index mod 2<>0 (or use the Odd-Function), if yes set Editor for second Column to Picklist else String?
https://lazarus-ccr.sourceforge.io/docs/lcl/grids/tcustomgrid.editor.html

EDIT:
Place a StringGrid on a Form
Set StringGrid-Options goEditing (goAlwaysShowEditor is optional)
add 2 columns

Code: Pascal  [Select][+][-]

1. unit Unit1;
2. {$mode objfpc}{$H+}
3. interface
4. uses
5.   Classes, SysUtils, Forms, Controls, Graphics, Dialogs, Grids, StdCtrls;
6. type
7.   { TForm1 }
8.   TForm1 = class(TForm)
9.     StringGrid1: TStringGrid;
10.     procedure FormCreate(Sender: TObject);
11.     procedure StringGrid1SelectCell(Sender: TObject; aCol, aRow: Integer;
12.       var CanSelect: Boolean);
13.   private
14.     MyPL:TStRingList;
15.   public
16.   end;
17. var
18.   Form1: TForm1;
19. implementation
20. {$R *.lfm}
21. { TForm1 }
22. procedure TForm1.FormCreate(Sender: TObject);
23. begin
24.   StringGrid1.Cells[0,1]:='1';
25.   StringGrid1.Cells[1,1]:='Test 1';
26.   StringGrid1.Cells[0,2]:='2';
27.   StringGrid1.Cells[1,2]:='Test 2';
28.   StringGrid1.Cells[0,3]:='3';
29.   StringGrid1.Cells[1,3]:='Test 3';
30.   MyPl:=TStringList.Create;
31.   MyPL.Add('Entry 1');
32.   MyPL.Add('Entry 2');
33.   MyPL.Add('Entry 3');
34. end;
35.  
36. procedure TForm1.StringGrid1SelectCell(Sender: TObject; aCol, aRow: Integer;
37.   var CanSelect: Boolean);
38. begin
39.   If StrToInt(StringGrid1.Cells[0,arow]) Mod 2<>0 Then
40.      Begin
41.        StringGrid1.Columns[1].PickList:=MyPL;
42.        StringGrid1.Columns[1].ButtonStyle:=cbsPickList
43.      end
44.   Else
45.      Begin
46.        StringGrid1.Columns[1].PickList.Clear;
47.        StringGrid1.Columns[1].ButtonStyle:=cbsAuto;
48.      end;
49. end;
50.  
51. end.
52.