Bug 140751 using a grid in a table does not update row value
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dnd/InsertInLayoutUtil.java
/**
	 * Checks if all the DataSetColumn has the same DataSet.
	 * 
	 * @param array
	 *            all elements
	 * @return false if not same; true if every column has the same DataSet or
	 *         the element is not an instance of DataSetColumn
	 */
	protected static boolean checkSameDataSetInMultiColumns( Object[] array )
	{
		if ( array == null )
			return false;
		Object dataSet = null;
		for ( int i = 0; i < array.length; i++ )
		{
			if ( array[i] instanceof ResultSetColumnHandle )
			{
				Object currDataSet = ( (ResultSetColumnHandle) array[i] ).getElementHandle( );
				if ( currDataSet == null )
				{
					return false;
				}
				if ( dataSet == null )
				{
					dataSet = currDataSet;
				}
				else
				{
					if ( dataSet != currDataSet )
					{