Toolbar Buttons not clickable when several msg selected

[greztok]

Hi there,

I've developed a zimlet to save emails and attachments for my company. It is working fine. The operation consists on drag & drop one or more emails on the zimlet item in the zimlet panel.
My users want a button instead of drag&drop because they say the item is too small and they frequently hit another zimlet item.

So I'v added a toolbar button, but the button turns gray and is not usable when more than one message is selected in the message list.

I checked the "com_zimbra_example_toolbarhook" zimlet, and it appears to react the same way.

Any idea on how to solve this?

Thx,

Sylvain