Accesing Elements from a Data Template to code

I am facing problem in Extracting the elements which are present in the Datatemplate from code.

<DataTemplate  x:Name="PickerItemTemplate"><StackPanel Orientation="Horizontal"><Rectangle  x:Name="selectcolor"  Fill="{Binding color}" Width="65" Height="65" Margin="0 0 0 0"></Rectangle></StackPanel></DataTemplate>