trace() not working. Flash

I chose new actionscript file(3.0) and wrote as simple as trace("Hello World");, but it is not working. I have flash player 10 and i also m开发者_StackOverflowade sure i have not checked omit trace statements in publish settings. Where am i going wrong? Please help.

i found the answer to my own question. On upper right of output panel, there is some silly icon, i clicked it and changed from none to "verbose". Works smooth and fine now :)