Steps:
1. Create a project. (Qt Quick Project>Qt Quick Application. Select the desktop, others are default.)
2. Go to 'Debug' view, start debugger and check the Exit button.

Actual result:
(Please see the attachment file.)

Expect result:
The button should be enable when start the debugger.

Comment:
Qt Creator 2.2.82, based on Qt 4.7.4
Build on July 22, 2011