Bug 390669 [Accessibility]Press 'Tab' doesn't focus on the next report item when adding relative period aggregation.
xtab/org.eclipse.birt.report.item.crosstab.ui/src/org/eclipse/birt/report/item/crosstab/internal/ui/dialogs/CrosstabBindingDialogHelper.java
}
	private boolean strEquals( String left, String right )
	{
		if ( left == right )
			return true;
		if ( left == null )
			return "".equals( right ); 
		if ( right == null )
			return "".equals( left ); 
		return left.equals( right );
	}
	private String getDataType( )
	{
		for ( int i = 0; i < DATA_TYPE_CHOICES.length; i++ )
		{
			if ( DATA_TYPE_CHOICES[i].getDisplayName( )
					.equals( cmbType.getText( ) ) )
			{
				return DATA_TYPE_CHOICES[i].getName( );
			}
		}
		return ""; 
	}
	public ComputedColumnHandle editBinding( ComputedColumnHandle binding )
			throws SemanticException
	{
		if ( isAggregate( ) )
		{
			binding.setDisplayName( txtDisplayName.getText( ) );
			binding.setDisplayNameID( txtDisplayNameID.getText( ) );