add:   var container = $('exceptionTraceContainer'); container.style.display = 'none'; this.__isShow = false; 
context: 	__preShow: function()	{		// disable the toolbar buttons		birtUtility.setButtonsDisabled ( "toolbar", true );				// disable the Navigation Bar buttons		birtUtility.setButtonsDisabled ( "navigationBar", true );	},
meta: 855	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/855/55f7d53941ffda624d27cf4aae3844244724ffe2/BirtExceptionDialog.js/clean/viewer/org.eclipse.birt.report.viewer/birt/webcontent/birt/ajax/ui/dialog/BirtExceptionDialog.js