source and .mc (may be jungles)

hi everyone,

so in order to save memory etc, I would like to recode one of my WF for 280x280 device,

so for the resource, it is ok with the ressource overriding, but what about the .mc with the OnUpdate?

I tried to understand the jungles but in vain...

could someone explain me how I can do ?

like if 280*280 use this .mc instead of

i thought about the app.base with returning an other view, but I don't think it will save memory.

many thanks