Hi,
Unfortunately it is difficult for us to provide support for versions going back that far. I looked through the
code from that version and it looks like the `ToolboxItemSelected` event didn't exist yet, so Blockly doesn't fire an event for a toolbox category being selected in that version. I don't have any other ideas for you that might be straightforward to implement, but you are welcome to look through the code yourself to see if you can find something.
We do strongly recommend that you update to a newer version if possible. It will be easier to use our docs and get support here in the forum, plus you'll get access to all the features we've added in the past four years! If you run into any problems while updating, we'd be happy to help resolve them here in the forum.
Best,
Maribeth
PS: Sorry if you receive this twice, I thought I sent it before and can't find it any longer.