title: Formula Evaluation issue with using org.apache.poi.ss.usermodel package
body: <p>I am using apache poi 3.6 with java to read excel files.initially i started with HSSF files.So, i was implementing <code>org.apache.poi.hssf.usermodel.*;</code> package for all those functionalities.</p>
  
  <p>For Example...</p>
  
  <p>1)  i am using <code>mySheet.setForceFormulaRecalcualtion(true);</code> => for formula must be recalculated when workbook is opened.</p>
  
  <p>2)<code>org.apache.poi.hssf.usermodel.FormulaEvaluator formulaEvaluator=new FormulaEvaluator(mySheet, myWorkBook);</code></p>
  
  <p><code>formulaEvaluator.evaluateFormulaCell(cell);</code>=> to evaluate the formula and save the result of the formula.</p>
  
  <p>But I want to use these functionalities for both HSSF(.xls) and XSSF(.xlsx) formatted files.so, now I am implementing <code>org.apache.poi.ss.usermodel</code> package to represent both .xls and .xlsx files.</p>
  
  <p>But I am able to do all those function that has already done in HSSF. But I can't do the above said 2 functionalities using this <code>org.apache.poi.ss.usermodel</code> package..</p>
  
  <p>Does anyone know the solution?</p>