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The code below uses the second override for the Confirm method which accepts for first parameter content, not DialogParameters. This is the reason why you get the "Telerik.Windows.Controls.DialogParameters" string as content.
What I would suggest is passing the handler using the DialogParamaters.Closed property. Please, refer to the code snipet below:
"Some other text"
Closed = (s, e1) =>
// do something
Hope this helps.
the Telerik team
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