Why doesn't the Visual Studio XAML designer work for Xamarin.Forms XAML files?
Xamarin.Forms doesn't currently support visual designers for XAML files. Because of this, when trying to open a Forms XAML file in either Visual Studio's XAML UI Designer or XAML UI Designer with Encoding, the following error message is thrown:
"The file cannot be opened with the selected editor. Please choose another editor."
This limitation is described in the Xamarin.Forms XAML Basics guide:
"There is no visual designer for generating XAML in Xamarin.Forms applications, so all XAML must be hand-written."
However, the Xamarin.Forms XAML Editor can be displayed by selecting the View > Other Windows > Xamarin.Forms Editor menu option.
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