Change 'Caption' on ToggleButtons with VBA
 

Try:

Sub addToggles()
Dim i As Integer
For i = 0 To 1
With ActiveSheet.OLEObjects.Add("Forms.ToggleButton.1", _
Left:=1 + i * 73, Top:=243, Width:=72, Height:=30.75)
.Object.Caption = IIf(i = 0, "Start Date", "End Date")
End With
Next
End Sub

Regards,
Greg