How do I use Windows Server DHCP for WLAN on SonicWALL TZ190 Wireless?

This is my first time setting up a SonicWALL TZ190 Wireless and I've run into something I've never seen before.  The wireless configuration incorporates a separate network interface for WLAN.  I have the LAN set at 192.168.1.x, but it wouldn't let me configure the WLAN at that subnet so I set it 192.168.2.x.  I am using DHCP on a Windows Server so had it turned off on the router.  What I found is that wireless clients would connect to the router and authenticate using the WPA authentication I have setup, but they would not pull an IP from the DHCP server (from the Windows server).  The only way I can get it to get an IP is to configure a DHCP scope for the 192.168.2.x subnet on the router and enable only that scope.  It doesn't conflict with the DHCP server on the Windows Server, but it doesn't allow the wireless clients on the same network as the wired and won't connect to the Windows Server.  I'm used to wireless routers that simply act as a wireless access point and will connect a wireless client to the Windows Server DHCP server.  This is new territory for me.  Any assistance would be appreciated.  Thanks.