title: Run-time error '438' when referring to a chart in VBA
body: <p>I want to manipulate an existing chart to filter data series and change title by clicking command buttons on a worksheet, but I'm getting runtime error 438 when trying to write code for some operations.</p>
  
  <p>First, a line
  <code>Worksheets("Report").ChartObjects("ChartVisitors").Visible=True</code> (or False)<br>
  works just fine, but when I try:<br>
  <code>Worksheets("Report").ChartObjects("ChartVisitors").ChartTitle.Text = "Test"</code> or<br>
  <code>Worksheets("Report").ChartObjects("ChartVisitors").FullSeriesCollection(25).IsFiltered = True (False)</code>, I get runtime error 438. Those two are pretty much the only properties I want to modify, I'm guessing my syntax is wrong? <a href="https://msdn.microsoft.com/en-us/library/office/ff195126.aspx" rel="nofollow noreferrer">MSDN</a> only specifies that the chart should have <code>.HasTitle</code> property set to True, which it does.</p>