Bug 312859 The list of operator for Chart filter does not provide 30 visible items
chart/org.eclipse.birt.chart.reportitem.ui/src/org/eclipse/birt/chart/reportitem/ui/dialogs/ChartCubeFilterConditionBuilder.java
expressionBuilder.setExpressionProvier( new ExpressionProvider( designHandle ) );
						else
							expressionBuilder.setExpressionProvier( expressionProvider );
					}
					if ( expressionBuilder.open( ) == OK )
					{
						String result = DEUtil.resolveNull( expressionBuilder.getResult( ) );
						int index = table.getSelectionIndex( );
						valueList.remove( index );
						valueList.add( index, result );
						tableViewer.refresh( );
						table.select( index );
					}
					updateButtons( );
				}
				else
				{
					editBtn.setEnabled( false );
				}
			}
		} );
		delBtn = new Button( rightPart, SWT.PUSH );
		delBtn.setText( Messages.getString( "FilterConditionBuilder.button.delete" ) ); 
		delBtn.setToolTipText( Messages.getString( "FilterConditionBuilder.button.delete.tooltip" ) ); 
		setButtonLayoutData( delBtn );
		delBtn.addSelectionListener( new SelectionListener( ) {
			public void widgetDefaultSelected( SelectionEvent e )
			{
			}
			public void widgetSelected( SelectionEvent e )