User extension does not draw in dev mode

Hi Everyone!

I'm pretty new with user extensions, so maybe my problem is a stupid one, but it already took me a day.

Started from an override of Ext.grid.Panel - everything was OK - and decided to make a package. It never draws in SA3 and shows in the log: Category: Design View, Message: Framework Error: object is not a function.

But the listing in the toolbox and the configs seem OK.

I've recreated the package numerous times, attached is the last just empty package, as a .zip of the \Extensions folder.

The package was compiled with no warnings, as per http://ift.tt/1tf6b1w

Please, advise, what am I doing wrong!

Thanks in advance!

Ilia

Attachment 50834

User extension does not draw in dev mode