I have installed Netbeans 7.0 (in window xp SP3) and I also installed "Wireless Toolkit 2.5".
But when I open Netbeans
File->New Project
then there is only option for Java SE and Java EE.
Not for Java ME.
I also try
Tools-> Plugin -> and search for Java ME
but I was not able to find "Java ME".
At first install 'Mobility' plugin for NetBeans IDE for J2ME development. You can do this from Tools
> Plugins
> (Select and install). Then DO this.. In netbeans, Tools
>Java Platforms
>Select Add Platform
>Select Java ME MIDP platform emulator
> select the one you installed now (Wireless Toolkit 2.5(location))
AFAIK you didn't use the Java ME supported Netbeans bundle. Download Netbeans with All(Its including Java ME) supported technologies and reinstall the Netbeans.
Edit: Netbeans 7.0 having Java_ME_platform_SDK_3.0. If you want to integrate Sun Java Toolkit 2.5, Just follow the @Sanjay steps.