function getChildrenFromAllAggregations(oParentOverlay) {
			var aAllAggregationNames = oParentOverlay.getAggregationNames();
			var aAllAggregationChildren = [];

			// Collect children from all aggregations of the parent
			aAllAggregationNames.forEach(function(sAggregationName) {
				var oAggregationOverlay = oParentOverlay.getAggregationOverlay(sAggregationName);
				var aAggregationChildren = oAggregationOverlay ? oAggregationOverlay.getChildren() : [];
				aAllAggregationChildren = aAggregationChildren.concat(aAllAggregationChildren);
			});

			return aAllAggregationChildren;
		}
This function returns all the siblings and parents inside the relevant container.
@param {sap.ui.dt.ElementOverlay} oOverlay Overlay from which we get the aggregations
@param {sap.ui.dt.ElementOverlay} oRelevantContainerOverlay Relevant container overlay
@param {int} iLevel Current level in the hierarchy
@param {boolean} bIncludeOtherAggregations Include also overlays from other aggregations from the parent
@returns {object} Returns a map with all siblings sorted by the level
@private