My budgies won't eat anything but seeds!?

I had budgies who would do the same thing no matter what i did they just refused to eat it. It turns out that budgies are creatures of habit. I could be that they were never introduced to fruit before by their previous owner. Just like if you were in some place new you didn't know ,you would probably refuse to eat most of the foods and stick to what you know. Your budgies are doing the same thing, they just don't want to risk becoming sick from eating a strange food they probably never seen before. However the only time I got on of my budgies to eat fruit was when I diced my apples in to really small pieces and mixed it in with there seeds. That could work. Good Luck