setgrid_custom

uiz_setGridObjects_script(grid,script)
Fills a grid up with certain objects. It will do this by checking the return value of a script specified at argument1.
Your script gets 2 arguments: and x and a y value which start at zero and go up to your gridw/h minus 1.
From these 2 values you will need to make your script return a valid INSTANCE ID, NOT an object_index.
This instance id must be different for every value inputted to the script or else conflicts can occour. You can use uiz_c() to create instances.
This script is mainly useful if you want to have one row filled up with a certain type of object and another row with another.
ONLY CALL THIS SCRIPT ONCE AFTER CREATING THE GRID.
It might be slightly more performance intensive if you use frames (uiz_setGridObjects_frame()) for everything if you just like to have a row of buttons or something.
In that case uiz_setgridobject uiz_setGridObjects_script might be a better solution.