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This took me a while to figure out so I thought I would post it on here just in case someone else is having the same problem. I have an Advanced Data Grid, but I don't want any separator lines between the headers. There are 2 styles and 1 property you need to set in an AdvancedDataGrid to make this happen. The styles are: header-separator-skin header-sort-separator-skin The property is: sortExpertMode I figured setting the styles to "null" would work, but it doesn't. Here is what you need to do: headerSortSeparatorSkin="mx.skins.ProgrammaticSkin" headerSeparatorSkin="mx.skins.ProgrammaticSkin" sortExpertMode="true" Or if you'd rather set the styles in CSS: header-separator-skin: ClassReference("mx.skins.ProgrammaticSkin"); header-sort-separator-skin: ClassReference("mx.skins.ProgrammaticSkin"); Sample with source Thanks to http://theflexguy.com/index.php?option=com_idoblog&task=viewpost&id=104&Itemid=54...

I'm working with another advanced data grid. The grid has a lot of columns and fitting it on one screen without a horizontal scroll is proving challenging. Here are a couple properties regarding headers that I found helpful: sortExpertMode - Setting this property to true removes that little vertical bar next to your header text. That frees up some horizontal space. headerWordWrap - Setting this property to true allows multi-line headers. You will need to set the Column width to force the text to wrap, and you'll probably need to set the header height since the default isn't tall enough to fit two lines of text. folderClosedIcon & folderOpenIcon - Setting these properties to {null} will remove the little folder icon next to the grouped item. You can also use these properties to show a custom icon.