If you are trying to display the list in a component dialog then you need to write a servlet/datasource. It will automatically change values if you delete something from the nodes.

Hi AnushaCould you please check if the author/publish server is not blocking traffic from dispatcher? You need to white-list dispatcher server.

Hi KannanYou need to enable styles for selection in your RTE dialog. Please follow the steps below:Enable the Style drop-down selector by enabling the pluginSpecify the location(s) of the stylesheet(s) you want to referenceSpecify the individual styles that can be selected from the Style drop down list