c# - Highlight date in WinRTXamlToolkit.Controls.Calendar -

i using winrtxamltoolkit.controls.calendar in windows 8.1 phone app , can display calendar using following code:

<page... background="{themeresource applicationpagebackgroundthemebrush}" xmlns:wpcontrols="using:winrtxamltoolkit.controls">  <grid>     <viewbox>         <wpcontrols:calendar              x:name="cal"             />     </viewbox> </grid> 

and in .cs file set display date using following code in onnavigatedto

cal.displaydate = new datetime(2015, 7, 7); 

but cannot highlight date , if has used control please give me advise on how set , highlight selected date? thank

thanks had set following date hhighlighted:

cal.selecteddate = new datetime(2015, 6, 7);