Extending : Widget extension : Enabling a customized widget in the XUI editor : Creating and registering widget mappings : Registering a widget mapping
  
Registering a widget mapping
1 In the Extensions tab of plugin file, click Add to open the New Extension window, and then select com.ibm.btt.tools.xui.editor2.generator. Click Finish.
2 Right click com.ibm.btt.tools.xui.editor2.generator, and then click New > mapping.
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3 In the Extension Details panel, select the mapping file that you defined in the file field.
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Creating and registering widget mappings