vartical axis title,scale and legend text is not visible in combo chart

[vishal padre]

google.charts.load('current', {'packages':['line', 'corechart']});

      google.charts.setOnLoadCallback(drawVisualization);

      function drawVisualization() {

  // Create and populate the data table.

  var data = google.visualization.arrayToDataTable(newarray1);

  // Create and draw the visualization.

  new google.visualization.LineChart(document.getElementById('chart_div')).

    draw(data, {height:500,

width:900,

hAxis: {title: '% Flow'},vAxes:[

      {title: '% time', titleTextStyle: {color: 'black'}, minValue: 0, maxValue: 50},

      {title: ' Operating cost', titleTextStyle: {color: 'black'}, minValue: 100, maxValue: 2000},

      {title: '', titleTextStyle: {color: 'black'}, minValue: 100, maxValue: 2000}

    ],legend:{position:'bottom'},

series:{

0: {type: 'bars',targetAxisIndex:0},

1: {targetAxisIndex:1},

2: {targetAxisIndex:2}

    }} );