I want to creat a qMRMLNodeCombobox to choose one of fiducial node

I know this question may be stupid, but it has been already struggling me for several days.

as you see, there is a fiducial node in the CTA image.

and I created a standard intial extension, insert a label called ‘lowerpoint’ and a qMRMLNodeCombobox.

I want to use this qMRMLNodeCombobox to choose the fiducial node, but the combobox is gray and can’t to interact with mouse. So, how can I use the combobox to choose the fiducial node?

I suspect the qMRMLNodeComboBox doesn’t yet have the mrmlScene set for it. MRML widgets are grey like that when this is the case.

node_combobox.setMRMLScene(slicer.mrmlScene)

sincerely thank you for your anwser. Magic, with only one line of code, this problem is just sovled. Magic