Icons that are greyed out shouldn't be clickable. Also, the "Delete" button looks more like a "Report as spam" button. I suggest a trash can icon instead.
I can't help with the disabling greyed out icons issue, but maybe the zipped .png files for a dustbin may help with the second suggestion
Regards Chris
Mmmh... They don't look very good, at least they don't fit the global look and feel of RoundCube which uses Tango icon set ::)
Not to worry ... I only wanted to show how easy it is to make simple buttons/icons using something like Photoshop.
By choice I NEVER use .png, preferring old fashioned .gif. But that's a personal preference - as is using what I want ... not fitting in with other schemes.
(ANARCHY RULES!!! Lol)