Returns the position of a child of the given control.
int IupGetChildPos(Ihandle* ih, Ihandle* child); [in C] iup.GetChildPos(ih, child: ihandle) -> pos: number [in Lua]
Returns: the position of the desire child starting at 0, or -1 if child not found.
This function will return the children of the control in the exact same order in which they were assigned.
IupGetChild, IupGetChildCount, IupGetNextChild, IupGetBrother, IupGetParent