Remove DataGrid Header Separator dynamically

Hello,
Scenario: I have a DG with 3 static columns and many dynamic columns added at run time.
I want to have one and only one header for all the dynamic columns.
In a way it can be seen as multiple datagridColumns (without headers) in  a single dataGridColumn (with only a header). Now there is a heavy traffic between static columns and the dynamic columns. So I dont think it is possible to have two different DG's.
My Attempts: I tried to use the HeaderSeparatorSkin to remove the header separators so as to give a feel of one single header. But since the headerseparatorskin is removed at DG level it can be either removed for all columns or for none.
My Question: I will have to create a custom DG so as to draw separator skin for few columns and remove for others. But I am not sure how can I do that since using "headerSeparatorSkin" removes it for all columns. Can some one show me a path as to how I can accomplish this?
A very bad way of accomplishing the above is to remove all the header separator skins and then use headerRenderer for the static columns to show a line similar to separator skin. But that is a bad way of coding I guess.
Thanks in advance,
Bhargav

Thank you for the reply Flex harUI.
If I understood right the renderer will extend a DG and will have columnns  and only one row. But the row color will not match the the row of the main DG.
Secondly I have using a checkbox renderer to be displayed in the columns created dynamically. The data of this renderer is changing with users interaction. Thus I am not very sure if implementing a renderer inside a renderer should be a good idea.
But I will try and use your suggestion to see if it can be used for my implementation.
Thanks again,
Bhargav

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