It seems that there is a bug when you try to save a bundle that is already contained in a bundle using icon view.
Although a window opens (with a proposed name for the bundle to be created) and returns no error when you click OK, the bundle is not created.
<hansl>
clear
bundle foo
bundle fooinside
M1 = I(3)
scalar c1 = 42
M2 = I(4)
scalar c2 = 43
foo.M1 = M1
foo.c1 = c1
fooinside.M2 = M2
fooinside.c2 = c2
foo.fooinside = fooinside
delete fooinside
delete --type=matrix
delete --type=scalar
</hansl>
At the moment you can do it only through script or the console (for example add the line: fooinside = foo.fooinside at the end of the script)
Thanks,
Yiannis