MS Access 2013 - form VBA to toggle between Datasheet and Form View

I am working in MS access 2013 and need VBA code that will allow me to determine if the subform that I am on is a datasheet or a form.

What I am trying to do is allow the user to click on the subform field "Reporting_Year" and have the subform switches to  a subform datasheet and then when the user clicks on the same subform field  "Reporting_Year the subform switches from a subform back to a datasheet.

The main Form is titled:  F-100-00 StartUpMain
The Subform is titled: F-100-01 CFR_Pivot -All Records

Example:
  Private Sub REPORTING_YEAR_DblClick(Cancel As Integer)
     If Form.subform is a datasheet then
         DoCmd.RunCommand acCmdSubformFormView
     else if
         Form.subform is SubformFormView  then
         DoCmd.RunCommand acCmdSubformDatasheetView
   end if
End Sub

Any assistance will be  appreciated

Ldufresne