Thank you, I was unaware you could use an image property on the item as the Icon in tree grid. I have managed to get somewhere close by creating an image column which can then be used as the icon which I populate in advance of running the query.
Can you create the image dynamically at run time? I.e. if you don't know the property until the query is run. Such as a Part BOM, where you don't know if a part is a parent or a child until the context item is passed to the query.
Did you make an extra column or did you overwrite the standard ItemType indicators? In my few quick tests I only used static codetree images. The Method rb_DefaultColumnBuilderMethod is used for the rendering, maybe this one is a good start for further investigations.
