When i send keys and add a click inside the Keys it then passes "Undefined"

When i send keys and add a click inside the Keys it then passes "Undefined" plus the correct data to the dropdown

Below is my code, see attached for dropdown layout, even when i separate the function calls, it clicks the dropdown and by the time it gets to the second line the pop up list disappears.

a.Click();

b.Keys(aqString.Trim(tempPathName, aqString.stAll));

b.Keys("[Tab]");

  var PathName = eval(genericPath);

  var tempPathName = context1.get(dataName);

  var objNames = objName;

      if(aqString.GetLength(tempPathName) != null) {

          b = PathName.PwcAutoComplete(objNames).TextInput(0);

          a = PathName.PwcAutoComplete(objNames).Button(0);

            if((b.Exists) && (b.Enabled == true)) {

                var fieldContent = getInputValue(b); 

                b.Keys(a.Click() + aqString.Trim(tempPathName, aqString.stAll));

                b.Keys("[Tab]");

                genCheckAlertFormPWC();

            }

      } else {

        Log.Warning("The Supplied data is not valid for the field, please check the data and try again.");

        aqUtils.Beep();

      }