Package body in read only

Hi
Whenever the code gets opened in the right pane there is and icon of <b> pencil </b> just left to finding the text text area. If you click on this icon the window would switch to read only mode.

Regards
Sagar

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I just started using SQL Developer. When I access Package Body it comes up directly in editor where I can make changes.. (I mean it opens directly in read/write mode). Is it possible to access the code for read only? like I can see the code but it should not allow me to change anything. Like in Toad there are two view. first view just to see the code and then if I have to make any changes then I load it in Editor.
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You can set the preference for the Code Editor.

Tools -> Preferences -> Code Editor -------There is a check box for 'Start in Read Only mode'