how to add or delete row to the datagrid after clicking a button in silverlight

Question

hi, i am working on silverlight datagrid view, here iam using two buttons one is ADD Row button and one more is REMOVE Row button. after clicking ADD Row button the row should be added to the datagrid, if i click on REMOVE Row button the selected row should removed from the datagrid. how to do this? please someone can help me how to do this using silverlight application