Maximize button in TK programs (using KDE)

Hi everybody, I use KDE as desktop and when I run an application programmed using TK (as AMSN) I am not be able to maximize the window because it has no maximize button and if I click in the properties of the window the maximize property is not activated. Anyone has the same problem, I use kde 3.3.1 and suse 9.1 but I had the same problem with kde 3.2. Cheers, Raúl