Bug 229084 [About] up/down buttons don't enable for About->Plug-in Details->Columns
The Columns dialog in About->Plug-in Details->Columns has an up and a down button. They don't enable when a list item is selected.
bundles/org.eclipse.jface/src/org/eclipse/jface/internal/ConfigureColumnsDialog.java
*/
	private int getColumnWidth(Item item) {
		if (item instanceof TableColumn) {
			return ((TableColumn) item).getWidth();
		} else if (item instanceof TreeColumn) {
			return ((TreeColumn) item).getWidth();
		}
		return 0;
	}
	/**
	 * @return
	 */
	private Item[] getViewerColumns() {
		if (targetControl instanceof Table) {
			return ((Table) targetControl).getColumns();
		} else if (targetControl instanceof Tree) {
			return ((Tree) targetControl).getColumns();
		}
		return new Item[0];
	}
	private void handleSelectionChanged(int index) {
		ColumnObject c = columnObjects[index];
		text.setText(Integer.toString(c.width));
		text.setEnabled(c.resizable);
		upButton.setEnabled(c.moveable && index > 0);
		downButton.setEnabled(c.moveable && index + 1 < table.getItemCount());
	}
	protected void okPressed() {
		int[] columnOrder = new int[columnObjects.length];
		for (int i = 0; i < columnObjects.length; i++) {