Customize a control and property nodes

I don't know if and how it is possible. Is it possible to customize a control, but having access to property nodes too? 
I explain better: if I create a control and I customize it, the customized control is a file.ctl, which has only front panel, but not block diagram. So that I cannot customize it using property nodes. Is there a way to bypass it?

You don't need to create a .ctl file to customize a control.  It is just there so you can save a control you have customized to a file.
Yes you can customize a control using property nodes.  You just use property nodes that are implicitly linked to a specific control, or you explicitly link to a control by passing a reference to the control to the property node.
If you want to programmatically save a customized control to a .ctl, or open a .ctl file and customize it further, I think you'll have to look into LabVIEW scripting.  But I wouldn't do anything like that if I were you until you get thoroughly comfortable with using regular property nodes, which I don't think you are otherwise you wouldn't have asked this question.

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