How to Call an userform's Control with its name stored in a worksheet

Hello,

1. on sheets(1), cells("A1") has the name of a combobox "cbx_test" .
2. on a userform1, I have created a combo called "cbx_test".

With VBA, when Userform1 initialise, I try to call the combobox with the value stored in "A1"

something like (this actual code doesn't work)

Private Sub UserForm_Initialize()

with sheet(1).range("A1").Value '="cbx_test"
   .AddItem "banana"
end with 

End sub

Thank you