Programmatically add Checkbox Content Controls to Word document using OpenXML

Is there an easy/straightforward way to dynamically add (not edit the value of) multiple checkbox controls in a .docx document body?

I tried appending a single SdtContentCheckBox after a new paragraph like this but with no luck:

newParagraph.Append(new SdtContentCheckBox());

and also followed the instructions here: http://ift.tt/2hB61mr and here: How do I create a check box in C# using Open XML SDK

The first one showed only how to add a text content control and the second one straight up resulted in a corrupted .docx file.

Any help would be appreciated!