Based on the information I got from the team, they are expected to be available around Crosslight 4 Update 3.

So, if you modify the PageLoad event in your sample to check for this situation, like I did with the attached code, it demonstrates the behaviour I've been seeing (that the first selected item is dropped from the display after the postback).

I modified the code in Page_Load so it now looks like following:

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        Dim checkedRows As ArrayList = WebGrid1.RootTable.GetCheckedRows()

        txtSelectedRows.Visible = True
        Dim text As String = "Checked rows: " & checkedRows.Count & vbLf & vbLf

        For Each keyValue As String In checkedRows
            text &= keyValue & ";"
        Next keyValue

        If checkedRows.Count = 0 Then
            text = WebGrid1.SelectedRowKeyValue()
        End If

        txtSelectedRows.Text = text
    End Sub

Save the changes and view the page in browser. The first selected item is not dropped from the display after postback. Please check the attached video which taken when test the scenario.

Sorry for the delay in sending this.

I modified BatchUpdateGuidProblem sample so it now works with batch update feature (insert, update, and delete transactions).

For more detail, please take a look OnBatchUpdate server-side event in BatchUpdateGuidProblem.aspx.cs file.

Please let me know whether this helps or not.

following Javascript code will hide the column using Grid's built-in AJAX request.

<script type="text/javascript">
    
        function HideColumn()
        {
            var grid = ISGetObject("WebGrid1");
            var col = grid.RootTable.Columns.GetNamedItem("EmployeeID");
            
            col.Set("Visible", "false", true);
            grid.RefreshAll();
        }
        
    </script>

This approach should be more solid since the Grid will re-initialize all settings after the column is removed.

I have tested the solution on IE 11; Chrome 43; and Mozilla Firefox 39 (with AllowAddNew enabled). Please let us know whether this helps or not.

Sorry for the delayed fix of CROS-803. I will check with the dev whether the hotfix can be scheduled to be released along with the Crosslight 4 Update 1.