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_CBcontainerPreRender
Defines a user callback on container pre render event

ObjContainer _CBcontainerPreRender (
ObjContainer _container_
fun [ObjContainer u0 [I I I I]] u1 _callback_
u0 _user_
)
Parameters

_container_
any ObjContainer
_callback_
callback function on container pre render (supplemental parameter is [x1 y1 x2 y2])
x1 and y1 are top left point coordinates of repaint rectangle
x2 and y2 are bottom right point coordinates of repaint rectangle
_user_
user parameter
Return value

same ObjContainer