Initializes the UI plugin.

Public Sub OnStartup( _
   ByVal PluginSite As IAgUiPluginSite _
) 

public void OnStartup(
   IAgUiPluginSite PluginSite
);

public: void OnStartup(
   IAgUiPluginSite ^ PluginSite
);

public  onStartup(
   IAgUiPluginSite PluginSite
);

public: HRESULT OnStartup(
   IAgUiPluginSite * PluginSite
);

OnStartup method is called by the hosting environment when a User Interface plugin is loaded or activated. The hosting environment passes the site object to the plugin to allow the plugin communicate with the hosting environment.