Popup in FPM using the message manager

Hi experts,

I`m using FPM and want to display certain warnings as popup. When I use the FPM Message Manager, method  REPORT_MESSAGE, REPORT_T100_MESSAGE or REPORT_BAPIRET2_MESSAGE and set import parameter IV_LIFETIME = 'POPUP_AUT' I get a popup, however this popup looks really ugly:

The text of the message is displayed just to about 28 characters and a horizontal scrollbar appears. Is there any way to influence the attributes (size and so on) of the popup?

Thanks,

Markus

P.S: I have asked this question already two years ago without success, just hoping there might be some new solution ;-)