Want to trigger "New defect" screen, once custom button clicked on the Reqs. module

Hi,

I have created a custom button on  Reqs. module and want to trigger "new defect" screen once clicked. Could anyone take a look at the below code and suggest? Thanks.

If ActionName = "CreateDefect" Then
defect1=MsgBox("Do you want to Create a Defect?", vbYesNoCancel, "Yes or No or Cancel")
If defect1 = vbYes Then
Action("act_add_bug").Execute
elseif defect1= vbNo then

......
 End If
End If

Regards.