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
.trim( )
						.equals( "" ) ) ) 
		{
			if ( dialog.getOkButton( ) != null )
				dialog.getOkButton( ).setEnabled( false );
			return;
		}
		if ( this.binding == null )
		
		{
			for ( Iterator iterator = this.bindingHolder.getColumnBindings( )
					.iterator( ); iterator.hasNext( ); )
			{
				ComputedColumnHandle computedColumn = (ComputedColumnHandle) iterator.next( );
				if ( computedColumn.getName( ).equals( txtName.getText( ) ) )
				{
					if ( dialog.getOkButton( ) != null )
						dialog.getOkButton( ).setEnabled( false );
					this.messageLine.setText( Messages.getFormattedString( "BindingDialogHelper.error.nameduplicate", 
							new Object[]{
								txtName.getText( )
							} ) );
					this.messageLine.setImage( PlatformUI.getWorkbench( )
							.getSharedImages( )
							.getImage( ISharedImages.IMG_OBJS_ERROR_TSK ) );
					return;
				}
			}
		}
		this.messageLine.setText( "" );