comboBox

// to add comboBox that works and does not jam up the simulation when selected and simulation is running
// options = ["N₀ =100","N₀ =4","N₀ =9","N₀ =16","N₀ =25","N₀ =36","N₀ =49","N₀ =64","N₀ =81","N₀ =121","N₀ =144","N₀ =169","N₀ =225","N₀ =289","N₀ =324","N₀ =361","N₀ =400","N₀ =1024","N₀ =1600","N₀ =2500"]
// OnChange
_view.comboBox.getSelectedOptionsIndexes(); // to get the index of the list on comboBox automatically

// to set
_view.comboBox.setSelectedOptions(["x vs t"]);

// to use
var opts = _view.comboBox.getProperty("SelectedOptions");  // array of options
    var option = (opts.length > 0)? opts[0]:""; // selected option 
if ( option=="user_defined"){
  
  }
else if ( option=="N₀ =4"){
  ni=2;
  fontdice ="normal normal 4vw ";
  }