/**
* Adds a border around the viewport.
*/
public void setViewportBorder(Border viewportBorder_) {
_border = viewportBorder_;
Insets insets = _border.getBorderInsets(this);
if (_headerViewport != null) {
// This must be a JTable.
_headerViewport.setLocation(new Point(insets.left, insets.top));
_childViewport.setLocation(new Point(insets.left, insets.top + 1));