Opening Routing Preferences of Duct Types via Revit API

[aryan4WGLU]

I would like to open the Routing Preferences Dialogue UI on Revit for a specific duct type using Revit API.

The way I achieve this through the UI is 

1. Select a duct type from available families in the project
2. Right-click and click on Type Properties...
3. Click on Routing Preferences "Edit" under Fittings
4. I get to the panel that I want (screenshot below)

The closest thing to what I want is this forum post: https://forums.autodesk.com/t5/revit-api-forum/trigger-quot-edit-type-quot-dialogue-box-from-api/td-...

However, even with this one, I failed to successfully open the Type Properties panel. I am able to select the duct type I'm interested in but the 

RevitCommandId.LookupPostableCommandId(PostableCommand.TypeProperties) fails with the error Invalid postableCommand error message.

Below is the sample code I used

var collector = new FilteredElementCollector(doc);

var ductType = collector
		.OfClass(typeof (DuctType))
		.First();

uidoc.Selection.SetElementIds(new[] {ductType.Id});

var commandId = RevitCommandId.LookupPostableCommandId(PostableCommand.TypeProperties);
uiapp.PostCommand(commandId);

However, even if this command works, my goal is to get to the Routing Preferences UI dialogue directly. Is there a way to do this? 

Any help is much appreciated 🙂