Hi Leo,

Glad it seems to be working. Ext Combos do require some non-intuitive configuration, but hopefully once you've got one working the rest should be easy. Ext4 seems to be a little simpler for combos when/if you start working with that.

With respect to custom Ext components: one of the advantages of a framework like Ext is that there are libraries of widgets to draw from, along with many user-provided extensions like the Supercombo. If you are writing a custom module, it's pretty easy to include and use these. It's usually smarter to draw from one of these rather than reinvent it. However, we want to be careful about what is included with LabKey by default. There isnt really anything labkey-specific about the SuperCombo, and therefore it probably would not get included unless actively used somewhere in the core. What's useful to one application may or may not be useful to another. In contrast, the Ext components that are part of the LabKey API (LABKEY.ext.Store, FormPanel, etc) all contain customization specifically designed for use with LabKey. Ext does seem to be incorporating more user-written widgets into its core library, and getting something like SuperCombo covered by Ext might be useful (I'm afraid that's completely out of our hands though).