Hi Arvind Dhasmana,
It is possible to insert the chart. I have created custom DayButtonStyle for the RadCalendar. The chart is Collapsed by default. The ControlTemplate for the DayButtonStyle defines several states for the role of the button and when it is in Date states the RadChart's visibility is set to Visible.
There is additional class that defines attached property which sets the ItemsSource of the RadCharts within the buttons. It uses ParentOfType to find the CalendarButton in which the chart is and gets the Date from it so you can set different sources for the different dates.
You can create additional attached property yourself that can be set on the RadCalendar and use it in some way to modify the date button charts.
You can further customize the RadCalendar's xaml to match your design. It's relatively easy to do so in Blend.
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