fnGetDrillStackDimensions = function(oChart) {
					const aDrillStack = oChart.getControlDelegate().getDrillStack(oChart);
					const aStackDimensions = [];

					aDrillStack.forEach((oStackEntry) => {
						// loop over nested dimension arrays
						oStackEntry.dimension.forEach((sDimension) => {
							if (sDimension != null && sDimension != "" && aStackDimensions.indexOf(sDimension) == -1) {
								aStackDimensions.push(sDimension);
							}
						});
					});

					return aStackDimensions;
				}
Creates the content for the chart toolbar.
@private