remove white background from text control

[Bart]

Hello,

Our company paper consists of a header on top and a big almost transparant
logo on the whole background.

Whenever I save a report to PDF, and later merge it trough other software
with our company paper, i see a clear white background on every text in the
pdf. How can I tell ax to make the background of the text control transparent?

I tried setting backstype to transparent instead of opaque but it doesnt work.