With this function scrolling the labels (in conjunction with a huge data amount) is very easy. You can add all labels at once (e.g. reading them from a file), then setting the range of the labels to be shown while your user scrolls through the chart.

Note: If this property and property LabelLastIndex are -1, all labels will be excluded, if both properties are 0, a previously defined range gets anulled, i.e. all labels will be included.