ExtJS Designer - how to add custom property

[mveronez]

Hi, guys.
Here we have extended components.
I did try to use Ext Designer to create these components, but i did not found how to add custom property.

There is any way to do that?

Thanks!

[TigrouMeow]

Is there a way? This post comes first on Google, so if there is a solution, it would be good to have it here :)