I've applied all of the following security settings to prevent a user from editing, moving, renaming, deleting files or folders from their images directory. However, even though all of the other buttons are disabled the "create thumbnail" icon is still active and allows the user to create a thumbnail. Is there a setting that I'm not aware of that will disable the "create a thumbnail" button on the style builder, background image dialog window?

 

ctlRTB.SetSecurityAllowCopy(false);
ctlRTB.SetSecurityAllowCreateFolder(false);
ctlRTB.SetSecurityAllowDelete(false);
ctlRTB.SetSecurityAllowDeleteFolder(false);
ctlRTB.SetSecurityAllowModify(false);
ctlRTB.SetSecurityAllowMove(false);
ctlRTB.SetSecurityAllowRename(false);
ctlRTB.SetSecurityAllowUpload(false);
ctlRTB.SetSecurityReadOnly();