How to create popup dialog page in eclipse plugin development

I am creating an eclipse plugin for my project. I want to have a popup dialog page when the user clicks a customized icon on the toolbar, kind of like Google App E开发者_Python百科ngine popup dialog, any ideas how to do it?

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You need

• a command
• a handler for the command
• a menu contribution for your toolbar
• a dialog

I have constructed a (very) small example that illustrates this...