rem: window.openDialog("chrome: 
add: window.openDialog("chrome: "mailnews:mailviewlist", "chrome,modal,titlebar,resizable,centerscreen", {onCloseCallback: ViewChangeByCustomValue}); 
context: function LaunchCustomizeDialog(){  // made it modal, see bug #191188  window.openDialog("chrome://messenger/content/mailViewList.xul", "mailnews:mailviewlist", "chrome,modal,titlebar,resizable,centerscreen", {onCloseCallback: refreshCustomMailViews});}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/41934e83c6a01c077de3feee1d5ab695cb0ba9c1/msgViewPickerOverlay.js/buggy/mailnews/extensions/mailviews/resources/content/msgViewPickerOverlay.js