Changing category inside a template binding

@turnert wrote:

I have a situation where, depending on the length property of a node, I want to display different templates.

Since this width can change via tools and updates to the node’s data, I have a binding on my template:

new go.Binding("width", "", (nodeData) => {
   if(nodeData.length === 0)
      this.diagram.model.setCategoryForNodeData(nodeData, "SmallTemplate");
   return nodeData.length;
}

I have the inverse logic on my other template (model.length > 0).

What happens is the correct template is chosen initially, and the template will change once when I update the length property, but then the template will never change again, even though I can step through the binding code in my debugger.

Is there a better way to do this?

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