Silverlight UserControl issue

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C#

C#4.0

Silverlight5

Hi All,
I am trying to create a Repeater Template User Control i.e. a rectangular border contains a row of UIElements Like TextBox, ComboBox etc and then I'm automatically adding a + button at the end of the Row. On + button Click I want to add the Same duplicate row below it.

This is the Syntax making use of User Control:

<RepeaterTemplate>
 <RepeaterTemplateItem>
  <TextBox />
  <ComboBox />
 </RepeaterTemplateItem>
</RepeaterTemplate>

I can't add the same row again as it gives error "Element is already child of other element".
If I duplicate the row using the memberWiseClone(), still on adding the duplicate row I'm getting the same error. May be bceause of non-null value of Parent property in the cloned duplicate row.

I don't know how to get this functionality working. Please HELP.

Thanks,
GK Prajapati