DataGridView Databound columns does not refresh if added on a later stage

Question

Ok I'm very new to this and I'm sure its probably somthin stupid but I have a DataSet with my dataTables and relationships and so on as the program developed I had to add more columns... I have done this with the same solution before and it worked fine. But now when I add a column to my dataset>DataTable by right Clicking on the table >Configure and adding the column it adds, "Preview data works" and the column also shows in my "Data Sources" if I dragg and drop it to my form as a Textbox it works with all with my relation ships as it should but when I go to DataGridView >Add Column > DataBound Columns it doesnt appear in the list I also tried making a completely new form add just droped the datagrid on it, it adds all the columns accept the new one... also "Edit Dataset with designer" Gives a weird error. Is there anything I should refresh or add manualy ? Any help would be appreciated
Thx