rem:  window.openDialog("chrome: "mailnews:mailviewlist", "chrome,modal,titlebar,resizable,centerscreen", {onCloseCallback: ViewChangeByCustomValue}); 
add: OpenOrFocusWindow({}, "mailnews:mailviewlist", "chrome: 
context: function LaunchCustomizeDialog(){  // made it modal, see bug #191188  window.openDialog("chrome://messenger/content/mailViewList.xul",                    "mailnews:mailviewlist",                    "chrome,modal,titlebar,resizable,centerscreen",                    {onCloseCallback: ViewChangeByCustomValue});}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/695c43ef8b097d5b096c2294136ca28dec518ea8/msgViewPickerOverlay.js/clean/mailnews/extensions/mailviews/resources/content/msgViewPickerOverlay.js