management vlan is always vlan 1 on 28xx switches. An option is to externally loop back a vlan 1 access port to a vlan XX access port.   This will allow you to manage the switch on any vlan.  Of course this burns 2 ports, not just 1.  But these switches are inexpensive, so you may have a hard time finding a less expensive solution just to avoid managing on vlan 1 or using the external loopback hack. Note: 28xx runs a single STP, so you will have to disable STP on the looped back ports if you go with this hack.
I had previously tried out the PowerConnect 27XX switches (primarily the 2708), and, while it functioned okay, it had one very, very frustrating feature: the management IP address was always assigned to VLAN 1 - there was no way to change this.  I'm wondering if anyone who has the 28XX series (2708 or 2716) could tell me whether they've added a way to change the management VLAN, or if the management VLAN is still glued to VLAN1?  This is a make-or-break feature - I can't waste a port on VLAN1 on the switch just to be able to manage it, as our current environment uses a different VLAN for management. Thanks, Nick
Management VLAN on PowerConnect 28XX Switches