I have the following tag:
<PublishingWebControls:RichLinkField FieldName="Buy_x0020_Now_x0020_Link" runat="server">
I want to have a custom rendering template for it as I need to emit the following html
<a href="link"><span>Link text</span></a>
There seems to be a
<CustomTemplate>
Tag, but I can't find any reference on the net on how to use it....