Bug 175766 Filter tab on a table is missing the Add buttons
There is no way to add/delete a filter on the table.
UI/org.eclipse.birt.report.designer.ui.views/src/org/eclipse/birt/report/designer/internal/ui/views/attributes/page/FormPage.java
sections = new SortMap( );
		composite.setLayout( WidgetUtil.createGridLayout( 1 ) );
		formSection = new FormSection( provider.getDisplayName( ),
				composite,
				true,
				isTabbed );
		formSection.setProvider( provider );
		formSection.setButtonWithDialog( withDialog );
		formSection.setStyle( style );
		formSection.setFillForm( true );
		addSection( PageSectionId.FORM_FORM, formSection );
		createSections( );
		layoutSections( );
		( (ScrolledComposite) container ).setContent( composite );
	}
	private void computeSize( )
	{
		Point size = composite.computeSize( SWT.DEFAULT, SWT.DEFAULT );
		( (ScrolledComposite) container ).setMinSize( size.x, size.y + 10 );
		container.layout( );
	}
	public void dispose( )
	{
		if ( !( provider instanceof GroupHandleProvider ) )
			return;
		Object[] elements = provider.getElements( input );
		if ( elements == null )
		{
			return;
		}