Making use of a function of an User Control from an aspx page

[Kai77]

I have this function in my codebehind of an ASCX file:

Public Function addRadiobutton(ByVal strID As String, ByVal strGroupName As String, ByVal Value As String) As PlaceHolder
Dim y As New RadioButton

y.ID = strID
y.Text = Value
y.GroupName = strGroupName

plhContent.Controls.Add
Return plhContent
End Function

It adds a radiobutton with the properties that have been passed to this function to a placeholder which has been coded in the .ascx using <asplaceholder ...>.

I want to use (load?) this user control and pass the variables to it from my aspx page. How can I achieve this?