Exporting to xlsx also export GridEditCommandColumn but should not

[Veronique]

Until recently I was exporting to Excel using ExcelML format.  The GridEditCommandColumn was not exported (ExportOnlyData is set to true).
I am now exporting using XLSX format.  Since then, the GridEditCommandColumn is exported along with data.
I would expect the same behaviour (no edit column). 

Is it a bug ? 
Is there an option to hide GridEditCommandColumn when exporting to xlsx ?

<telerik:RadButton ID="ButtonExportExcelML" runat="server" Text="Export to ExcelML" OnClick="ButtonExportExcelML_Click" />
<telerik:RadButton ID="ButtonExportXLSX" runat="server" Text="Export to XLSX" OnClick="ButtonExportXLSX_Click" />
<telerik:RadGrid ID="RadGrid1" runat="server" AutoGenerateColumns="true" ExportSettings-ExportOnlyData="true" OnNeedDataSource="RadGrid1_NeedDataSource">
    <MasterTableView>
        <Columns>
            <telerik:GridEditCommandColumn ButtonType="ImageButton" />
        </Columns>
    </MasterTableView>
</telerik:RadGrid>

protected void RadGrid1_NeedDataSource(object sender, Telerik.Web.UI.GridNeedDataSourceEventArgs e)
{
    RadGrid1.DataSource = new List<int> { 1,2,3,4,5,6};
}

protected void ButtonExportExcelML_Click(object sender, EventArgs e)
{
    RadGrid1.ExportSettings.FileName = "TestExcelML";
    RadGrid1.ExportSettings.Excel.Format = GridExcelExportFormat.ExcelML;
    RadGrid1.ExportToExcel();
}

protected void ButtonExportXLSX_Click(object sender, EventArgs e)
{
    RadGrid1.ExportSettings.FileName = "TestXlsx";
    RadGrid1.ExportSettings.Excel.Format = GridExcelExportFormat.Xlsx;
    RadGrid1.ExportToExcel();
}

[Viktor Tachev]

Hello,

In order to prevent the edit column from exporting you can set the Exportable property for it to false.

<telerik:GridEditCommandColumn Exportable="false"></telerik:GridEditCommandColumn>

Regards,
Viktor Tachev
Telerik by Progress