Bug 192349 The column selected disappears when you reclick the downward arrow [0001]
Description: The column selected disappears when you reclick the downward arrow. Build number: 2.2.0.v20070613-1211 Steps to reproduce: 1, New a table binding to a data set, add an Aggregation, select one column from the "Data Field" dropdown list, click the downward arrow again. Expected result: The column selected is still there. Actual result: The column selected disappears. Error log: N/A
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/BindingDialogHelper.java
if ( binding.getName( ).equals( name ) )
				return binding.getExpression( );
		}
		return null;
	}
	private List getFunctionArgNames( String function )
	{
		List functions = DEUtil.getMetaDataDictionary( ).getFunctions( );
		List argList = new ArrayList( );
		for ( Iterator iterator = functions.iterator( ); iterator.hasNext( ); )
		{
			IMethodInfo method = (IMethodInfo) iterator.next( );
			if ( method.getName( ).equals( function ) )
			{
				Iterator argumentListIter = method.argumentListIterator( );
				IArgumentInfoList arguments = (IArgumentInfoList) argumentListIter.next( );
				for ( Iterator iter = arguments.argumentsIterator( ); iter.hasNext( ); )
				{
					IArgumentInfo argInfo = (IArgumentInfo) iter.next( );
					argList.add( argInfo.getDisplayName( ) );
				}
				break;
			}
		}
		return argList;
	}
	public void save( ) throws Exception
	{
		if ( txtName.getText( ) != null
				&& txtName.getText( ).trim( ).length( ) > 0 )