Qt 4.5.0 under MacOS-X

Hello!

I hope, amongst you there are some Qt/Mac developers who can help me or have an idea to solve my issue. I've got a physical mac and a mac-vm inside VMWare Fusion. When running my Qt-Application under the Os installed on the physical mac, it works pretty fine for me; but inside the VM i can neither click on any button nor move the window away. curiously, the application can be closed normally from the dock. My development-mac-os-x is Version 10.5.6 and the mac i've installed inside the VM is version 10.5. I heared, that Qt-Applications can run on OS-X 10.4.x upwards...
can you help me?

Sincerely

Sebastian