Up to your questions:
- To close a RadWindow from within the content page, you need to get a reference to the window by using the GetRadWindow() function and then call its close() method. Depending on your scenario, you can return an argument from the content to the parent page by using either OnClientClose or the ClientCallBackFunction eventhandlers. More information on the subject and code sample is available in the documentation, section RadControls/RadWindow/Programming/Using RadWindow As A Dialog (online version).
- RadComboBox does not have internal rebind / refresh so when closing the window you should either update your database and call DataBind() for the combobox or as an alternative - add the new item to the already loaded ones. More information on the subject is available in the documentation and in the following demos:
- You can do this by using FindItemByText or FindItemByValue client-side methods:
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