Dashboard Filter from a dimension to a measure (w/o parameters)?

Hi all,

I'm creating a demographics dashboard.  the first view is a simple Gender breakdown, by count:

The second view is a geographical map:

The functionality I'd like is to click on Female in the first dash, and update the geographical map to display a calculated field Female Percentage:

COUNT(IF [Gender]='Female' THEN [Gender] ELSE NULL END) / Count([Gender])

Likewise, when I click on Male, the geographic map should update to display Male Percentage:

COUNT(IF [Gender]='Male' THEN [Gender] ELSE NULL END) / Count([Gender])

I've tried to do this via another calculated field, Percentage Switch - Gender:

if ATTR([Gender]) = 'Male' then [Male Percentage]

elseif ATTR([Gender]) = 'Female' then [Female Percentage] END

But, as you might have guessed, this doesn't work, because it filters down to only male or female values, and shows all percentages as 100%.  Is there any way to accomplish this functionality, preferably without parameters?  Sample workbook attached.