🚀 go-pugleaf

I'm trying to get access to CmdHistory's Undo() method, and InterfacePtr returns nil, I searched through archive, didn't find anything but in header file of ICmdHistory.h says :
"There is only one global CmdHistory. In order to use it you have
to specify the target (ICommandMgr) you are interested in "

I have some snippet of the code here:

InterfacePtr<IWorkspace> ws(GetExecutionContextSession()->QueryWorkspace());
if(ws == nil) {
   break;
}

InterfacePtr<ICommandMgr> cmdMgr(ws, IID_ICOMMANDMGR);
if(cmdMgr == nil) {
     break;
}
InterfacePtr<ICmdHistory>	cmdHistory(cmdMgr, UseDefaultIID());
f(cmdHistory == nil) {
     break;
}
cmdHistory returns nil

I also tried passing with document's UIDRef instead of cmdMgr, didn't help either.
What i'm trying to do is, I want to Undo my last command (used CmdUtils::CreateCommand() to do some actions ) programmatically, now the Undo under edit menu works fine in GUI, I want to be able to do it through the CmdHistroy->Undo(). Do I have any other option to undo the result of my last command ?

Any help greatly appreciated.

Thanks,
Kamran