Can't see the ok-button in the adress window of kmail

Hello list, I've a strange problem. Dont ask me why and how, but I have achieved to change the size of the popup window for selecting Email adresses in kmail (the three dots ... at the right hand site of the "to" and "copy" field, in a manner that I dont see the ok and the cancel button any more. I can change the window's size with the mouse as I want, but I never see the "ok" and "cancel" button again. They remain below the lower border of the window? Has anypne an idea, how I can get rid of the problem? I am running SuSE Professional 9.2 with it's KDE. Alexander