You created a new .xml and placed it into SmartvueDef folder on the Core
You then ran LDGather.exe from the ManagementSuite folder and confirmed that the .xml is copied into the Smartvue folder
You grab your iPad or iPhone , launch the SmartVue app and cannot see the category listed in the menu.
You need to close the SmartVue app and launch it again.
To close the App please have a look at the follwoing link