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TAdvStringGrid
How to handle the event of changing the combobox from the TColumnComboEditLink component in a TAdvStringGrid

Following code with a TAdvStringGrid and a TColumnComboEditLink on the form demonstrates how you can handle the ComboChange event: 

procedure TForm1.AdvStringGrid1GetEditorProp(Sender: TObject; ACol,
  ARow: Integer; AEditLink: TEditLink);
begin
  ColumnComboEditLink1.Combo.OnChange := ComboChange;
end;

procedure TForm1.AdvStringGrid1GetEditorType(Sender: TObject; ACol,
  ARow: Integer; var AEditor: TEditorType);
begin
  AEditor := edCustom;
  AdvStringGrid1.EditLink :=ColumnComboEditLink1;
end;

procedure TForm1.ComboChange(Sender: TObject);
var
  cc: TColumnComboBox;
begin
  cc := Sender as TColumnComboBox;
  advstringgrid1.Cells[0,0] := inttostr(cc.ItemIndex) + ':'+ cc.ComboItems.Items[cc.ItemIndex].Strings[0];
end;