Dialogbox with radiobutton

Hi,

I want to create a simple dialog box, with radiobutton based on a enum.

I found the following code on the web, but the result is a dialogbox with a combobox instead of a radiobutton:

static void CreateRadio(Args _args)
{
Dialog dialog = new Dialog();
DialogField df;
FormRadioControl frc;
;
df = dialog.addField(EnumStr(projUpdateSubProjStage));
frc = df.control();
frc.helpText("Project status");
dialog.run();
}

And then how can i retreive the response of the dialogbox into a variable?

Can someone help me please