igNumericEditor percentage

v17.2

We have a system that use Infragistics controls to allocate funds.  Over the years we assign amounts by specifically allocating from a pool.  Now a request has come to allow allocation by a percentage.

So I have a label that displays a pool a funds.  Say $120.  The managers can add in $24 to represent 20% of the pool.  I want to allow users to type in 20%, but then translate it to the correct amount in dollars.

I see that with v17.2 the "includeKeys" options is no longer exposed and cannot be overridden.  How can I allow users to type in a percent sign that I can translate into actual dollar amount for the numeric editor?