iRule editor partition button does not work

Hello, 

This may or may not help you directly, however, its our primary guidance on troubleshooting iRules.  
iRules Troubleshooting Tips

Thank you for letting us know this is an issue you're experiencing. After reviewing the article if you are still experiencing the issue we may need more information to identify what is the potential root cause of what you're experiencing. 
For example what version of the Editor are you using?
F5 Editor Eclipse Plugin v2

Please let us know if the information provided helped in resolving your issue.