I had the same problem a few months ago and it set me back for a long time on my current project. unfortunately, it boiled down to me writing my own treeview system and treeview renderer (which renders the tvw to a canvas). I highly suggest this method as you have full control over everything - currently mine supports color schemes, Icons and multiple selections. and it is really fast - rendering takes around 0.05 secs.
Unfortunately I'm not quite ready to release the source to this as it is the key ingredient to my current project and it is partially intertwined with my internal engine. However, once my project is finished I do plan on cleaning up the tvw system and making it more general-purpose.
Just to give you an idea of the great quality you can get using this method, check out the screenshot below
Unfortunately I'm not quite ready to release the source to this as it is the key ingredient to my current project and it is partially intertwined with my internal engine. However, once my project is finished I do plan on cleaning up the tvw system and making it more general-purpose.
Just to give you an idea of the great quality you can get using this method, check out the screenshot below