Touch UI Dialogs Stripping out Custom Data Elements

I've been working through several examples for AEM 6.0/6.1 online to hide/show elements on my AEM 6.3 dialog and I have the listener JS functions properly firing finally but the issue seems to be with the removal of customer data elements from the Touch UI dialog fields when the dialog is created.

One such example AEM 6 Touch UI Show/Hide Checkbox associated  panels . It enables hiding/unhiding of other components based on the selec…

For instance with the code provided below the elements are created in the dialog but the show-hide-target, should-show-when-checked fields are not being created and the class field doesn't seem to be updating either if I leave it as class instead of wrapperClass like i have below which will at least set the class correctly on the wrapping div tag.

So the question is based on .content.xml for my dialog.  How do I properly set the class and add other elements to the TouchUI dialog for AEM 6.3 so that my extra elements aren't removed.

      <option jcr:primaryType="nt:unstructured"

                          sling:resourceType="granite/ui/components/coral/foundation/form/checkbox"

                            text="Show other fields"

                            fieldDescription="Anchor heading will only be visible in the navigation bar"

                            name="./showInNavOnly"

                            value="true"

                           show-hide-target="show-dropDown-panel"

                            should-show-when-checked="false"

                            wrapperClass="cq-dialog-checkbox-showhide"/>

<setChildren

                            jcr:primaryType="nt:unstructured"

                            sling:resourceType="granite/ui/components/coral/foundation/container"

                            wrapperClass="hidden showhide-target"

                            id="show-dropDown-panel">

                            <items jcr:primaryType="nt:unstructured">

                            <testing

                                        jcr:primaryType="nt:unstructured"

                                        sling:resourceType="granite/ui/components/coral/foundation/form/textfield"

                                        fieldDescription="TESTING FIELD"

                                        fieldLabel="TESTING FIELD"

                                        name="./testing"/>

                                        </items>

                        </setChildren>