Bug 174701 [Viewers] ViewerRow should be reused instead of connected to the Item
Currently we create a ViewerRow ver every Item we create this can degrade performance, we should cache the row and reuse it
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ViewerCell.java
* 
	 * @param column
	 */
	void setColumn(int column) {
		columnIndex = column;
	}
	/**
	 * Set the row to rowItem and the columnIndex to column.
	 * 
	 * @param rowItem
	 * @param column
	 */
	void update(ViewerRow rowItem, int column) {
		row = rowItem;
		columnIndex = column;
	}
	/**
	 * Return the item for the receiver.
	 * 
	 * @return {@link Item}
	 */
	public Item getItem() {
		return row.getItem();
	}
	/**
	 * Get the control for this cell.
	 * 
	 * @return {@link Control}
	 */
	public Control getControl() {