WeBuilder, otherwise a great tool, does not properly support custom syntax highlighting with altered background colors. I like to use a different background colour for PHP and HTML sections so that scripted parts stand out more. Setting the background colour of all PHP elements to a light shade of gray, however, gives me this:

As you can see, whitespace (specifically tabs) within a PHP tag cannot be coloured. There should be a class "PHP Whitespace" that includes both spaces and tabs within PHP tags. Furthermore, operators cannot be coloured separately (I'm not sure which class applies to them, but it's not one of the PHP colour classes).
What I expect to get is something like this (a screenshot of the same filed viewed with another editor),

perhaps even with an option to colour the (virtual) whitespace at the end of each line, too:

It would be nice to see this fixed.
best, drjee