/** Removes the projection ruler column and the painter from the projection viewer. */
protected void doDisableProjection() {
if (fPainter != null) {
fViewer.removePainter(fPainter);
fPainter.dispose();
fPainter = null;
}
if (fColumn != null) {
fViewer.removeVerticalRulerColumn(fColumn);
fColumn = null;
}
}
