Get Class Default

I am trying to get the defaults of a class, the variable i am trying to access is within the parent of the class and exposed to the child where i set the default, in this case a SlateBrush, I am then trying to create a dynamic UI based on how many items i have and then set the icon for each item using the SlateBrush i set in the child. I am doing this from an array using class references of the parent class.

Calling GetClassDefaults returns the correct variable, but the variable has no values set so my image remains empty.
How can i access the child’s default SlateBrush in this case?