I have just tested this in a Sitefinity 6.0 project and I can verify that the fields are present in the custom Taxonomy control which inherits from the TaxonomyControl class.
I am sending attached a short video for your convenience demonstrating the results on my side (Categories_HierarchicalView.zip
). As you can see in the video I have extracted in the root of my project solution the files attached to my reply from the 5th of February (I have also attached it to this ticket for your convenience - TaxonomyControlExtended.zip
Then I built the solution and registered the SitefinityWebApp.TaxonomyControlExtended
control using Thunder.
In the video I just demonstrated which is the control you need to register with Thunder. It was already registered in my project and this is why I pressed Cancel. You need to continue with the widget registration until Thunder says it is properly registered in the Toolboxes. Then restart the application in order for the changes to take effect.
After performing the above you should be able to drop the custom TaxonomyControlExtended widget on a page. It should have the same properties in the designer as the built-in Categories widget - including the FieldName, TaxonomyId.
Please download the attached custom taxonomy control and follow the steps from the video I have attached and it should work properly on your side.
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