How to use styled checkboxes into headers and groups?

Suite and Optimus Suite 5
#1

I add checkbox into group titles and header. But it does not look like checkboxes in “ch” field and forms. How can I add the same checkbox?

#2

The “ch” column uses the image for the checkbox displaying. You may try to include the similar image in your header. It can be find in the “imgs\dhxgrid_material” folder. item_chk1.gif, item_chk0.gif icons.