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
{
				( (GridData) argsComposite.getLayoutData( ) ).heightHint = 0;
				
			}
			this.cmbDataField.setEnabled( function.needDataField( ) );
			Control control = (Control) cmbDataField.getData( "express" );
			if ( control != null )
				control.setEnabled( function.needDataField( ) );
		}
		else
		{
			( (GridData) argsComposite.getLayoutData( ) ).heightHint = 0;
			
			
		}
		argsComposite.layout( );
		composite.layout( );
	}
	private void createExpressionButton( final Composite parent, final Text text )
	{
		Button expressionButton = new Button( parent, SWT.PUSH );
		if ( expressionProvider == null )
			expressionProvider = new BindingExpressionProvider( this.bindingHolder );
		UIUtil.setExpressionButtonImage( expressionButton );
		expressionButton.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				ExpressionBuilder expression = new ExpressionBuilder( text.getText( ) );
				expression.setExpressionProvier( expressionProvider );
				if ( expression.open( ) == Window.OK )