BSP Extensions: method implementation

Hello together,
I am currently trying to implement custom BSP Extensions (taglibs). Almost everything works, I can use my element, it is also shown in the Tag browser in SE80, but I really have no idea on how to implement the rendering.
The documentation exactly leaves out the part on how to actually draw the custom HTML, I can only find info on how to manipulate the element's given content within the BSP. So far, I have overriden (redefined?) the methods DO_AT_BEGINNING and DO_AT_END and somewhere I found that M_OUT attrib. When calling m_out->print_string( 'Hello' ), nothing happens
Has anyone some example coding on how to do the actual drawing of the component? I have taken a look on the standard BSP extensions in HTMLB (like button and so), but could nowhere find the actual rendering stuff.
Please help me
Thanks in advance for any hints or samples.
Greetings, Timo

Let me answer for you the final part of the puzzle.
You write:
<% extension ...%>, the elements got printed, otherwise
When we have a BSP page, we can have actually XML on the page. So the pre-processor sees something such as this:
<myLib:myTag a1 = "v1">
</myLib:myTag>
It is going to say, aha, here we have some nice XML code coming down the pipe. Good for you. This XML is now placed as a string (what more is XML than a string?) and send to the browser. So if you do a view source in the browser, you should see your XML.
In summary, we aim to please, and XML is high on our list things we like.
So what is a man to do? You must write onto the page:
<%@extension name="myFirstLib" prefix="myLib"%>
This line the pre-compiler eats. And then after a moment of silence, it accepts that you don't like XML. Anything that now just looks like "<myLib:*>" is immediately understood to be a tag. Thus the compiler is informed, and it will generate the correct ABAP code to call this tag.
And this pre-compiler believes in perfection: mylib is NOT equal to myLib. It is case sensitive!
In summary: one slip of the finger, and you tag gets seen as XML and rendered out as raw string.
(With a syntax check step, and not a compile step, you will also get a warning about this. Just to be a little helpful.)

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BSP Extensions: method implementation

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