How can I change the button that is in the view

I have a toggle button that is on the Viewer![alt text][1]

the problem is , when it turn on , How can reco开发者_高级运维ver the last status . like even though the default value is false , how to set it true programmatically.

In the plugin.xml , the default status is true.

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If have contributed it via commands, you need to switch the state of the command (see HandlerUtil.toggleCommandState() method) and then call ICommandService.refreshElements() to update all the contributions for that command