Scratch

I am having issues with run-time method validation.  Here is an example:

script variables (a)
set [a] to (object[sprite1])
run([test] of [sprite1])

(hopefully my scratch code will show up properly)
Note: This is a contrived exampleto demonstrate my point...

If I try to replace sprite1 with variable "a" the "[method] of [object]" block does not recognize the variable "a" as an object of that type and wipes out the reference to the method. like so:

script variables (a)
set [a] to (object[sprite1])
run([    ] of [sprite1])

If I use the "tell [object]" block it creates duplicate copies of any methods I insert into the C-part but actaully seems to run the correct method anyway (as long as you do not try to delete the local duplicate.)

Is there a proper way to get around this?

Thanks...