exp = keyChooser.getText( );
exp = keyChooser.getText( ).trim( );
	private String getKeyExpression( )	{		String exp = null;		if ( keyChooser.getSelectionIndex( ) != -1 )		{			exp = DEUtil.getExpression( columnList.get( keyChooser.getSelectionIndex( ) ) );		}		else		{			exp = keyChooser.getText( );		}		return exp;	}