MainPopupStep  
    private inner class MainPopupStep(val templatesOnly: Boolean) : TemplateJTree.AddButton.AbstractPopupStep(source)
The top-level PopupStep, which includes the default templates and various reference types.
Parameters
templatesOnly 
true if and only if non-Template schemes cannot be inserted
Functions
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                  Returns a separator if value should be preceded by a separator, or null otherwise.
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                  Returns true if and only if value equals the Template or TemplateReference entry.
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                  Returns true if and only if value is a Template or templatesOnly is false.