Bug 210892 [Regression]The arguments of aggregation builder can not be modified
Description: [Regression]The arguments of aggregation builder can not be modified Build number: 2.3.0.v20071126-0800 Steps to reproduce: 1, New a table 2, Drag a aggregation builder into table 3, Specify the datafield, function to percentile and argument to 0.3 4, Reopen the aggregation and change the argument to 0.4 Expected result: After step4, the artument is changed to 0.4 Actual result: Nothing happened after step4, the argument is still 0.3 Error log:
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/BindingDialogHelper.java
return new IAggregationInfo[0];
		}
	}
	/**
	 * fill the cmbDataField with binding holder's bindings
	 */
	private void initDataFields( )
	{
		cmbDataField.setItems( getColumnBindings( ) );
		if ( binding != null && binding.getExpression( ) != null )
		{
			cmbDataField.setText( binding.getExpression( ) );
		}
	}
	private String[] getColumnBindings( )
	{
		List elementsList = DEUtil.getVisiableColumnBindingsList( getBindingHolder( ) );
		String[] bindings = new String[elementsList.size( )];
		for ( int i = 0; i < bindings.length; i++ )
		{
			bindings[i] = ( (ComputedColumnHandle) elementsList.get( i ) ).getName( );
		}
		return bindings;
	}
	private void initGroups( )
	{
		String[] groups = getGroups( );
		if ( groups.length > 0 )
		{
			cmbGroup.setItems( groups );