add:  var pos = YAHOO.util.Dom.getX(this.frontBuffer) + this.borderLeft; if (this.dragState.startX == event.pageX - pos) {  this.selectionStartTime = null; this.selectionEndTime = null;  this.redrawOverlayOnly(); }  
context:     selectionMouseUp: function(event) {        if (!this.selectionSweeping)            return;        this.selectionSweeping = false;        this.onSelectionChanged.fire("range", this.selectionStartTime, this.selectionEndTime);    },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/f56c4ae0c605557d83f59fb5f76adf94999bb3c7/graph.js/clean/webtools/new-graph/js/graph.js