update of LiveTile Control to allow the usage ot DataTemplateSelector

[stumpyfr]

update of LiveTile Control to allow the usage of DataTemplateSelector, not the perfect integration but it's working and useful.

With the current datacontext logic, Its not possible to apply a DataContentSelector. To fix that, I call manually the DataTemplateSelector after each switch on the current and next item.

It's working and allows the creation of many different ContentTemplate in a easy way.

The fix answers the issue #221

[dotMorten]

I think this is a neat idea. A few comments to the pull request:
I don't think the ContentTemplateSelector binding in generic.xaml is needed (code is used to select templates, and I think this might cause it to be hit twice). If it is needed, I would have some concern wrt to breaking any users who have custom templates already.

I would skip the sample and keep it the simple way, to avoid confusion for the general case.

I think the only code really needed is the bit in LiveTile.cs

[stumpyfr]

Oh my....yes the ContentTemplateSelector Binding isn't needed anymore...was my first test :/.
My mistake, we can delete that binding, everything is done in the code now.