Hi Matt,

 thanks for your answer.  I tried out your suggestion, but it doesn't solves my problem. I extented the content of the column header with following code, but only a part of it is shown. 

 private void gridDocExporter_HeaderCellExporting(object sender, Infragistics.Win.UltraWinGrid.DocumentExport.HeaderCellExportingEventArgs e)
        {
            try
            {
                if (e.HeaderType == Infragistics.Win.UltraWinGrid.DocumentExport.HeaderTypes.GroupHeader)
                    e.Cancel = true;

                if (e.HeaderType == Infragistics.Win.UltraWinGrid.DocumentExport.HeaderTypes.ColumnHeader)
                {
                    e.ColumnHeaderContainer.Height = new FixedHeight(30);

                    e.GridHeader.Caption = (e.GridHeader.Group.Tag as string) + System.Environment.NewLine + e.GridHeader.Caption;
                }
            }
            catch {}
        }

I just used 30 as an example of the height.  Are you saying that the width is being clipped in this case?  If that's the case, you may have to adjust the column widths in the BeginExport event (I'm not sure if there's a better event for that).  If it's the height that's the problem, does a larger value help?  It's possible that the exporter is overwriting the height when exporting, so you may want to try using the HeaderCellExported event instead.

-Matt