Change user groups permission in Ms Access

[junis]

Dear All,

if i want to change permission in Ms Access, i just follow this step
1. click "Tool" -> "Security" -> "User Group Permissions"
2. I choose User in Box User/Group Name then select listbox "Object Name"
3. then i check Permission that i want
4. click ok
5. done

but sometimes .. i need change user/groups at runtime (in another application with VB)

now ...i need example for that problem & some tips / trick to change user groups Permission With Code VB

regards

-junis-