Handle close event on project customizer

Hi, 

I have the following code and I need to either handle the Cancel button click of the 'dialog' or its close event. How do I do it. My code: 

@Override 
    public void showCustomizer(String preselectedCategory, String preselectedSubCategory) { 
        Dialog dialog = ProjectCustomizer.createCustomizerDialog( 
                CUSTOMIZER_FOLDER_PATH, 
                Lookups.fixed(project), 
                preselectedCategory, 
                new OKOptionListener(), 
                null); 
        dialog.setTitle("Project Properties - " + ProjectUtils.getInformation(project).getDisplayName()); 
        dialog.setVisible(true); 
    } 

Thanks. I use CustomizerProvider2. 

Regards, 
Volodymyr.