public ContentControl(SdtElement sdtElement, bool isDescendantOfAContentControl,
TemplateDocument templateDocument)
{
if (sdtElement.IsContentControl() == false)
{
throw new ArgumentException("The provided SdtElement is not a content control", nameof(sdtElement));
}
TemplateDocument = templateDocument;
SdtElement = sdtElement;
IsDescendantOfAContentControl = isDescendantOfAContentControl;
Tag = sdtElement.GetContentControlTag();
Type = sdtElement.GetContentControlType();
descendingControls = new List <ContentControl>();
}