From 5acdcce35c0435a77b1b0c07ed9ac4d24192be2b Mon Sep 17 00:00:00 2001
From: Matt Gallagher <matt@compositional-it.com>
Date: Fri, 28 Jun 2024 14:26:04 +0100
Subject: [PATCH] Fix onColumnGroupOpened

---
 src/AgGrid.fs | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/AgGrid.fs b/src/AgGrid.fs
index c8c3069..f2485f5 100644
--- a/src/AgGrid.fs
+++ b/src/AgGrid.fs
@@ -559,12 +559,17 @@ type AgGrid<'row> =
                 {|
                     AutoSizeGroupColumns =
                         fun () ->
-                            // Runs the column autoSize in a 0ms timeout so that the cellRendererFramework cells render
-                            // before the grid calculates how large each cell is
+                            // Runs the column autoSize in a 0ms timeout so that the cellRenderer cells render before
+                            // the grid calculates how large each cell is
                             JS.setTimeout
                                 (fun () ->
-                                    let colIds = ev?columnGroup?children |> Array.map (fun x -> x?colId)
-                                    ev?columnApi?autoSizeColumns colIds)
+                                    let colIds =
+                                        ev?columnGroups
+                                        |> Seq.head
+                                        |> fun cg -> cg?children
+                                        |> Array.map (fun x -> x?colId)
+
+                                    ev?api?autoSizeColumns colIds)
                                 0
                             |> ignore
                 |}