f-es you are correct, this is what i ended up doing.
For Each r As GridViewRow In GridView3.Rows
Dim GridView4 As GridView = CType(r.FindControl("GridView4"), GridView)
For Each row As GridViewRow In GridView4.Rows
Dim CheckBox11 As CheckBox = CType(row.FindControl("CheckBox11"), CheckBox)
Dim Label100 As Label = CType(row.FindControl("Label100"), Label)
Dim Label101 As Label = CType(row.FindControl("Label101"), Label)
Dim Label102 As Label = CType(row.FindControl("Label102"), Label)
If CheckBox11.Checked = True Then
ScriptManager.RegisterStartupScript(Me.Page, Me.Page.[GetType](), "showalert", "alert(' Checked!');", True)
Else
ScriptManager.RegisterStartupScript(Me.Page, Me.Page.[GetType](), "showalert", "alert(' Not Checked!');", True)
End If
Next
Next