Add customized control on run time

Hello .

I have made a customized control on my workbook which consists of on option button (Name SRQCOb) and a label (Name SRQCL). This new control is named SRQC.

How can I add an SRQC customized control on my Form (Name Userform1) on runtime? I tried

dim ctrl as object
set ctrl = userform1.controls.add("Forms.SRQC.1")

and

dim ctrl as object
set ctrl = userform1.controls.add("SRQC")

but I get an invalid class string error for each case.

Any advices are welcome.

How have you created this custom control?

I designed them on the form, selected them together, dragged them to a new page on the toolbox and renamed SRQC the new control. Then I deleted them from the form.