Bug 136833 Group key is affected by Generate All button in group.
Description: Group key is affected by Generate All button in group. Steps to reproduce: 1. Insert a list 2. Add a group, select a group key, then click Generate All button. Actual result: Group key disappeared, you have to reset it.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/GroupDialog.java
}
		}
		IChoice[] choice = new IChoice[choiceList.size( )];
		return (IChoice[]) choiceList.toArray( choice );
	}
	/**
	 * Get columnDataType
	 * 
	 * @return
	 */
	private Class getColumnType( )
	{
		for ( int i = 0; i < columnList.size( ); i++ )
		{
			Object dataSetItemModel = columnList.get( i );
			if ( dataSetItemModel instanceof DataSetItemModel )
			{
				if ( ( (DataSetItemModel) dataSetItemModel ).getDataSetColumnName( )
						.equals( keyChooser.getText( ) ) )
					return DataType.getClass( ( (DataSetItemModel) dataSetItemModel ).getDataType( ) );
			}
		}
		return null;
	}
	/**
	 * Reset intervalType
	 * 
	 * @param choice
	 */
	private void resetIntervalType( IChoice[] choice )