Stacked Bar Chart - Need Decimal on one Bar, Percentage on Another (only with slicer selection)

[lg1551]

I have a stacked bar chart on a slicer which uses two measures (one for each bar).

Both metrics should be decimal format, UNLESS a slicer selection is made, then one measure (bar) should be formatted to a percentage. 

I've written the percentage measures for these slicer selections, and as a measure in and of themselves, they display properly in the bar chart.

But when I write the toggle measure to use those % measures when the slicer is made, it defaults them to decimal. I've even tried using the FORMAT function in the measure to force it but it won't work.

Is this even possible in PBI?

[lg1551 · Accepted solution]

Found my answer here with the new feature that has been added: https://powerbi.microsoft.com/en-ie/blog/deep-dive-into-the-new-dynamic-format-strings-for-measures/