add:  ClearMessagePane(); } 
context: function FolderPaneSelectionChange(){	var tree = GetFolderTree();		if(tree)	{		var selArray = tree.selectedItems;		if ( selArray && (selArray.length == 1) )			ChangeFolderByDOMNode(selArray[0]);		else		{			var threadTree = GetThreadTree();			ClearThreadTreeSelection();			threadTree.setAttribute('ref', null);			ClearMessagePane();		}	}}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/4a407a1700be281629df7b9e47a09b2ebb03d739/commandglue.js/clean/mailnews/base/resources/content/commandglue.js