BoundField "child" in aspx

Question

I have a gridview with a columns, and inside that columns I have boundfields.

<Columns> 
<asp:BoundField headerStyle-Wrap="false" ItemStyle-Wrap="false" HeaderText="A" DataField="A" />
<asp:BoundField headerStyle-Wrap="false" ItemStyle-Wrap="false" HeaderText="B" DataField="B" />
<asp:BoundField headerStyle-Wrap="false" ItemStyle-Wrap="false" HeaderText="C" DataField="C" />
<asp:BoundField headerStyle-Wrap="false" ItemStyle-Wrap="false" HeaderText="D1" DataField="D1" />
<asp:BoundField headerStyle-Wrap="true" ItemStyle-Wrap="false" HeaderText="D2" DataField="D2" />
<asp:BoundField headerStyle-Wrap="true" ItemStyle-Wrap="false" HeaderText="D3" DataField="D3" />
</Columns>

I have a picture that explains what I have, and what I am looking to achieve, here it goes:

Answer 1

Just as you have ItemTemplate to keep your design in gridview cell, you also have HeaderTemplate to customise header design. Googling took me to this simple article