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
ColumnObject columnObject = columnObjects[i];
			columnOrder[i] = columnObject.index;
			setColumnWidth(columnObject.column, columnObject.width);
		}
		setColumnOrder(columnOrder);
		super.okPressed();
	}
	/**
	 * @param column
	 * @param width
	 */
	private void setColumnWidth(Item item, int width) {
		if (item instanceof TableColumn) {
			((TableColumn) item).setWidth(width);
		} else if (item instanceof TreeColumn) {
			((TreeColumn) item).setWidth(width);
		}
	}
	/**
	 * @param columnOrder
	 */
	private void setColumnOrder(int[] order) {
		if (targetControl instanceof Table) {
			((Table) targetControl).setColumnOrder(order);
		} else if (targetControl instanceof Tree) {
			((Tree) targetControl).setColumnOrder(order);
		}
	}
}