RAZER SYNAPSE issue - binding modifier key only to mouse button is not working

I just bought Razer Naga Trinity, I tried to bind any modifier key only to mouse button on the Razer Synapse but it does not work, I hold it and press a key, it only types the key, it should launch the action. I also tried Macro with Command Left Down only on the macro, it behaves like sticky key. Have anyone got this working on their mouse? **EDIT** I was having problem with binding any modifier like mouse buttons 3, 4, 5 in the screenshot.