Displaying only the First and Last Element Label
This article describes how to hide all but the first and the last element labels using CSS.
Step-by-Step-Guide
Insert the following CSS code in the "custom.css" of your application and change the chart name (<ChartName>) to the actual one from your application.
#<ChartName>_control .barLabels
{
display: none;
}
#<ChartName>_control .barLabels:first-child,
#<ChartName>_control .barLabels:last-child
{
display: block;
}