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Using Ajax File Browser you can create custom dialogs that has look and fill of Ajax File Browser, as well as you can customize context menus to add, delete or disable menu items.
This demo adds 'My Custom Dialog ...' context menu to Files View Panel and a button on a Toolbar Panel that displays custom dialog. It also disables 'Delete' menu, removes 'Custom Properties...' menu and renames 'Copy' menu to 'Copy to Buffer'.
See Customizing Context Menu and Creating Custom Dialogs for more details.