Update Unipager if BasicReapeater was updated

Hello,

I have a PagesDataSource, BasicRepeater, Filter (with a custom filter) and two Unipagers (one of them on the top of BasicRepeater's Zone and another one on the bottom of it) web parts in the different Zones. All web parts have their own UpdatePanel. On the code behind of custom filter I've written a piece of code to update the BasicRepeater according to the filter has been selected on postback.

// Get the webpart repeater which we want filter it
CMSAbstractWebPart rptTarget = RequestStockHelper.GetItem("productsList") as CMSAbstractWebPart;

if (rptTarget != null && rptTarget.UseUpdatePanel)
{
    rptTarget.ReloadData();
    rptTarget.UpdatePanel.Update();
}

Now I want to update also both Unipagers of BasicRepeater.

Can anyone help me to find a way for accessing Unipagers of BasicRepeater to update them?