Hiding first detail row when group is collapsed

I've looked at previous questions in this forum, in particular this one, and not been able to find a solution.  I have a simple table initially created with the wizard and  a detail group added to deepest child group.

[[Year] [[Month] [[Country] [[Detail1] [Detail2] |[Sum(Amount)]

[Year  
  [Month    
    [Country      
      = Group1

What I find is that when I collapse any of my [Year], [Month] or [Country] groups, the table still displays the first detail row group. 

I've tried adding a Total below my detail group "=Group1" and setting Row Visibility to Hide; this partially works by only hiding my first detail group column [Detail1] but leaving [Detail2] visible. This simplified example has only two detail columns; however in my report I have 20 or more.

I set Row Visibility to Hide as I would like to avoid showing an additional row for each group.

Perhaps I am missing something but does anyone know how I can display the detail data only if the groups are not collapsed?