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UI Spec defines buttons [OK] [Cancel] in Java Platform manager but there is [Close] instead.
subcomp->project
Currently there is no way how to do OK/Cancel in this dialog. Platform customizers are provided by other modules and are not under the control of Java Platform module. In case of Cancel there is no way how to rollback the changes done by them. The UI spec should be updated to contain only "Close" option.
According to http://projects.netbeans.org/nonav/buildsys/j2se-project-ui-spec-promoe.html#Dialog_Java_Platform_Manager UI spec has not been updated still.
The "Close" button is okay. I won't update the UI spec because it's old and there's been many changes in implementation anyway so the spec is no longer strictly followed.