Cast LiteralControl to WebControls.button

Is there any way to add attributes to a template button in a gridview.  I've tried to Ctype the control in the column but it gives me an invalid cast expection.  What I'm trying to do is add rollover effects thru a codebehind page.  Any ideas?

Code:
Protected Sub dgvPartPrice_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles dgvPartPrice.RowDataBound
            Static intRowCounter As Integer = 0

            Dim i As Integer
            For i = 0 To dgvPartPrice.Rows.Count - 1
                Dim btnPrice As Button = CType(dgvPartPrice.Rows(i).Cells(0).Controls.Item(0), Button)
               
                btnPrice.Attributes.Add("OnMouseOver", "this.style.cursor='hand';this.style.border='Outset';style.borderWidth='2'")
                btnPrice.Attributes.Add("OnMouseOut", "this.style.cursor='default';this.style.border='Solid'; style.borderWidth='1'")
            Next
        End Sub