To configure the syntax highlighting feature you have to go to Colors & Fonts settings. In the Tapestry tab you can then choose the syntax coloring scheme that you prefer.
Component tags highlighting
You can configure the plugin to highlight every Tapestry specific tag and tag parameter in your template. If you do, you will be able to easily identify in your template what are normal tags and Tapestry tags.
If you get an inspection reporting invalid tag attributes then it's because you have an inspection that checks if your using any HTML tag parameter that your not supposed to. When using Tapestry you will have to use special tag parameters so if you don't want to get this warning just turn off the "HTML tags and attributes conventions" inspection that you can find under "HTML Inspection".