I want to -
Is it possible and if yes then can some one point out any documentation or example to achieve this?
OR else is there a way to extend dashboard functionality in plugin's webpage, to make it gadget container?
I am sure that it's possible to implement 1, 2 & 3 however it will not be an easy task.
I advise you to check how it's done in JIRA (JIRA sources are open to everyone who bought it and can be downloaded under atlassian account). I monitored actions that are invoked for "Create dashboard" and "Add gadgets" screens and noted mappings for you:
Action URL Class Create dashboard https://MY-JIRA/secure/AddPortalPage!default.jspa com.atlassian.jira.web.action.user.AddPortalPage Add gadgets https://MY-JIRA/secure/Dashboard.jspa com.atlassian.jira.web.action.Dashboard
You need to examine the appropriate classes and copy - paste and then adjust the code. It could be useful to debug appropriate JIRA actions.
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