Hi Sam,
Thank you for your interest in Syncfusion Products.
It is possible to customize the appearence of the columns in MultiColumnTreeView control using ColumnStyles settings and ColumnHeaderBackground property. Please refer to the below online tutorial links that illustrates this:
http://help.syncfusion.com/ug_71/toolswin/ColumnAppearance.htmlhttp://help.syncfusion.com/ug_71/toolswin/StylesArchitecture2.htmlhttp://help.syncfusion.com/ug_71/toolswin/ColumnStyles1.htmlPlease let me know if any concerns.
Regards,
Fathima