Can I create new instance of form using a variable?

My code currently is similar like this:
Select Case strForm
Case "var1"
popUpForm = new Form_var1
Case "var2"
popUpForm = new Form_var2
Case "var3"
popUpForm = new Form_var3
End Select
Is there any function similar to Forms(strForm) to refer to the object type that can be used after new keyword? Any suggestion?

I can't use the DoCmd.OpenForm as I need multiple instance forms.