[Enhancement] Xamarin.Forms.TemplateUtilities.GetTemplateChild(string name) should be accessible from exterior namespaces

[Juansero29]

Summary

This method should be accessible from other namespaces than only the 'Xamarin.Forms' namespace. It was mentioned by @davidbritch on the 4.1 pre-release blog article as available, but it isn't. When trying to use it from a TemplatedView, I get the error 'TemplateUtilities' is inaccessible due to its protection level. Simply put, Xamarin.Forms.TemplateUtilities should be public, since it has public methods inside.

API Changes

Xamarin.Forms.TemplateUtilities and its public methods would now be accessible outside the Xamarin.Forms namespace.

e.g.

<controls:MyCustomControl... >
    <controls:MyCustomControl.ControlTemplate>
         <ControlTemplate>
              <Label x:Name="myLabel"/>
         </ControlTemplate>
    <controls:MyCustomControl.ControlTemplate>
</controls:MyCustomControl>

namespace MyCustomApp 
{
class MyCustomControl : TemplatedView
{
      Label _myLabel;

       protected override OnApplyTemplate()
       {  
               _myLabel = Xamarin.Forms.TemplateUtilities.GetTemplateChild("myLabel");
       }
}
}

Intended Use Case

I intend to force some properties of a control (let's say a checkbox) under certain conditions inside the code of my CustomControl. This can only be achieved by having a reference to the said checkbox and changing its properties. I already use a 'self-made' GetTemplateChild method, but I would like to use the official API from Xamarin.Forms.

@andreinitescu see this.