Linkbutton in asp:reapeater - all in user control, needs to register linkbuttons with ajax

I have a master page with the ajax script manager on it.

the master page then has a user control, which contains an asp:repeater which renders asp:LinkButtons on the page, i need them to be registered with the script manager so that they will only cause page re-renering in the content.

The problem i am facing is getting access to the ScriptManager in the master page fron theRepeater1_ItemCommand event in the user control.

Any thoughts, THanks

To programmatically access the scriptmanager:

Dim sm as ScriptManager
sm = ScriptManager.GetCurrent(Page)