Updating code refactor menu items after file switching

Now active Main.as(AS3): ![2014-05-08 15 56 51](https://cloud.githubusercontent.com/assets/1700940/2915112/0b0eb39c-d6a8-11e3-9aa0-c13db13dd856.png)
Move to PluginMain.cs(CSharp): ![2014-05-08 15 57 20](https://cloud.githubusercontent.com/assets/1700940/2915116/19ed661a-d6a8-11e3-8723-20e4f94a025b.png)

After fix.
Move from Main.as to PluginMain.cs: ![2014-05-08 16 01 27](https://cloud.githubusercontent.com/assets/1700940/2915147/91750472-d6a8-11e3-8636-415a948da0fb.png)