give it time.
as long as the BD is healthy and eating crickets and worms don't stress on the veggie intake.
yes you want him/her to eat them and you will .... but some BD's start veggies later than others, some are just as picky as we are... 
as was said, mix the crix and worms with the veggies.
also try this:
early am before the BD's is even awake make a nice salad and spay it with a bit of water and put it in the cage.
when the lights come on and the BD first warms up the water will also get the attention. may drink the water off the leaves and munch a few.
on some days hold back on the crix and worms till later, try and get the BD to eat a few greens / veggies first then add the crix / worms.
set a pattern of fresh salad first every day.
as time goes by the BD will adapt and eat the veggies first.
also see if you can find a color or flavor the BD likes.
examples:
fresh strawberrys or blackberrys
mint leaves
edible flowers such as home grown roses that have not had any bug spray *EVER*
rose petels and several other flowers are edible for us and BD's
the smell and color may trigger the BD to dig in.
try different items in small amounts with the base veggies.
just like us they get "bored" with the same stuff!
one day my BD loves COllards another day he craves Kale
Go figure!
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