-I figured out where i am going wrong. While setting focused element type in constructor i am using RadDataBoundListBox instead of RadDataBoundListBoxItem.
Here is right code :
public TicketEditHomeView()
{
InitializeComponent();
// Set the Context menu...
RadContextMenu.SetFocusedElementType(this.uiTimeEntryList, typeof(RadDataBoundListBoxItem));
}