1. In OpenShift Explorer tab, right-click a connection and click 'New OpenShift Application'.
2. From the embedded cartridges list, select the check box for the MySQL Database 5.1 cartridge.
3. Change your mind, so clear the check box for the cartridge.
4. A warning prompt is then displayed: 'You are about to remove ... Removing a cartridge is not reversible ... Are you sure?'

The prompt seems unnecessary for the New OpenShift Application wizard. All I did was pick a cartridge and then changed my mind. I haven't actually created the application yet so where's the danger in removing a cartridge?

[Obviously, the prompt is entirely appropriate for existing applications when users choose to edit the embedded cartridges.]