add:  var row = {}, colID = {}, childElt = {}; dirTree.treeBoxObject.getCellAt(event.clientX, event.clientY, row, colID, childElt); if (row.value == -1 || row.value > dirTree.view.rowCount-1) {  return; } 
context: function DirPaneDoubleClick(event){  // if the user clicks on the header / trecol, do nothing  if (event.originalTarget.localName == "treecol")    return;  if (dirTree && dirTree.treeBoxObject.selection && dirTree.treeBoxObject.selection.count == 1)    AbEditSelectedDirectory();}
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