capture objects with other captured texture

hello,

sorry for bothering again, but seems textures are a bit nasty for me,
also didn`t find it well documented,

i`m trying to capture the whole rendering of points with texture made
from capturing
.gl.gridshpape,
when bind to other texture the previous texturing disappears,
it sounds a bit complicated probably,
so please find example patch attached which i hope is more clear,

thanks,
wojciech