Adding UI elements in Editor - Eclipse plugin

If anyone is aware of Omondo plugin for Eclipse, I would like to add UI elements to my own eclipse plugin editor, like Omondo does. e.g. adding a new class diagram creates a box with the class name in it.

How should I go ab开发者_运维百科out this development? I am a complete newbie with respect to Eclipse plugins and it would be great if I can get pointers for this.

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For graphical editors in Eclipse, have a look at the GEF, GMF, and Graphiti projects.