If you would like to configure the popup button for the picker you can use the DatePopupButton
"my popup tooltip"
With that said, would you elaborate in more detail what are your requirements? What would you like to configure for the popup button?
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items