Datagrid Header image

hi,
i am using datagrid to display records of the table.i am facing one problem, i want to show an image in one of the column header along with the text,means first it will show column name & then the small image of arrow.when i will click on that image the records will get sort(ascending or desc) on the basis of that column(for e.g. date wise),also i want that image should change means when records are in ascending order it should show upper-arrow image,when desc then other image down-arrow.

can you tell me how to do that,my code behind is in VB.