Nevermind, I found the attribute I was looking for.
Here's an example of what I did.
This creates a new column, row, and DataGridTableStyle and puts it into a DataGrid.
Public table1 As New DataTable("rundata")
Public rpmcolumn As DataColumn = New DataColumn("RPM")
rpmcolumn.DataType = System.Type.GetType("System.Int64")
table1.Columns.Add(rpmcolumn)
Public ds As New DataSet
ds.Tables.Add(table1)
DataGrid.SetDataBinding(ds, "rundata")
Dim row As DataRow
row = table1.NewRow()
row.Item("RPM") = 2000
table1.Rows.Add(row)
Dim ts As New DataGridTableStyle
ts.MappingName = "rundata"
DataGrid.TableStyles.Clear()
DataGrid.TableStyles.Add(ts)
DataGrid.TableStyles("rundata").GridColumnStyles("RPM").Width = 75
DataGrid.TableStyles("rundata").GridColumnStyles("RPM").Alignment = HorizontalAlignment.Center
DataGrid.TableStyles("rundata").GridColumnStyles("RPM").NullText = ""