>I tried that, but it still shows the base class value at design time. I already have code in the init of the container to set the value in the label, so it does get shown properly at run time. It's just hard to use at design time.

Michael,
Create your own builder then. A builder need not be registered and even simply could be written & executed from command window. ie:
-Select your containers
-Go to command window
modi comm dummybuilder

lnContainers=aselobj(arrMyContainers)
for ix=1 to lnContainers
 with arrMyContainers[ix]
   .Label1.Caption = .cCaption
 endwith
endfor

-Select & execute. You might choose not to save at all.
Cetin