My solution was to just force call the refresh button through the menu/form after completing the “split”.
MethodInfo mi = typeof(EpiBaseForm).GetMethod("handleToolClick", BindingFlags.Instance | BindingFlags.NonPublic);
mi.Invoke(InventoryQtyAdjustForm, new object[]{"RefreshTool",new Infragistics.Win.UltraWinToolbars.ToolClickEventArgs(InventoryQtyAdjustForm.MainToolManager.Tools["RefreshTool"],null)});
Also make sure to add the using System.Reflection; Grabbed the form name from the tree.