[Access 2007] Cannot get a split-form to work as subform

[i_Am_ToO_SeXy]

Hi all

First post here, after a long-time-reading

i'm experiencing an issue in access 2007.
I have 2 forms, the second one is a subform of the first and his visualization mode is set to "Split Form".
When i change from "Structure view" to "Mask view" on the second form it works great, but.. if i use it as a subform i get a normal mask visualization.
what can i do to avoid this?

PS: sry for my very bad english T_T