html/scripts/highchart/modules/treemap.src.js
function (point) {
			var series = this,
				drillId = false;
			if ((point.node.level - series.nodeMap[series.rootNode].level) === 1 && !point.isLeaf) {
				drillId = point.id;
			}
			return drillId;
		}
function (point) {
			var series = this,
				drillId = false;
			if ((point.node.level - series.nodeMap[series.rootNode].level) === 1 && !point.isLeaf) {
				drillId = point.id;
			}
			return drillId;
		}
function ( point ) { var series = this , drillId = false ; if ( ( point . node . level - series . nodeMap [ series . rootNode ] . level ) === 1 && ! point . isLeaf ) { drillId = point . id ; } return drillId ; }
Finds the drill id for a parent node.
Returns false if point should not have a click event
@param {Object} point
@return {string || boolean} Drill to id or false when point should not have a click event
Finds the drill id for a parent node . Returns false if point should not have a click event