Often times, you want to customize the popup that shows up when you click on the export button.
Like we saw in the renderers topic, the grid.popupFactoryExportOptions gives you a class factory that should return an instance of ExportOptionsView. This can be your own class.
grid.popupFactoryExportOptions = new flexiciousNmsp.ClassFactory(flexiciousNmsp.CustomExportOptionsView);
The CustomExportOptionsView is a class that renders the popup for the export.
A running example of how this can be done is demonstrated in this blog post: http://blog.htmltreegrid.com/post/How-to-Customize-the-Pager-(Toolbar)-Export-Options-Settings-and-Save-Settings-Popups.aspx