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
andLable = null;
		}
		valueListComposite = new Composite( parent, SWT.NONE );
		GridData gdata = new GridData( GridData.FILL_HORIZONTAL );
		gdata.horizontalSpan = 4;
		valueListComposite.setLayoutData( gdata );
		GridLayout layout = new GridLayout( );
		layout.numColumns = 4;
		valueListComposite.setLayout( layout );
		Group group = new Group( valueListComposite, SWT.NONE );
		GridData data = new GridData( GridData.FILL_HORIZONTAL );
		data.heightHint = 118;
		data.horizontalSpan = 3;
		data.horizontalIndent = 0;
		data.horizontalAlignment = SWT.BEGINNING;
		data.grabExcessHorizontalSpace = true;
		group.setLayoutData( data );
		layout = new GridLayout( );
		layout.numColumns = 4;
		group.setLayout( layout );
		new Label( group, SWT.NONE ).setText( Messages.getString( "FilterConditionBuilder.label.value" ) ); 
		GridData expgd = new GridData( );
		expgd.widthHint = 100;
		addExpressionValue = new Combo( group, SWT.NONE );
		addExpressionValue.setLayoutData( expgd );
		addBtn = new Button( group, SWT.PUSH );
		addBtn.setText( Messages.getString( "FilterConditionBuilder.button.add" ) ); 
		addBtn.setToolTipText( Messages.getString( "FilterConditionBuilder.button.add.tooltip" ) ); 
		setButtonLayoutData( addBtn );
		addBtn.addSelectionListener( new SelectionListener( ) {