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I have an android project targeting API level 14.
The GridLayout should be available in the toolbox.
If a gridlayout is added manually, then selected, grid specific properties should be displayed in the properties window. But they are not.
On windows, I am also unable to find GridLayout in the toolbox, as well as view the GridLayout specific properties for a GridLayout that has been manually added via XML . (Both X.S. and VS)
On OSX I am unable to repro, I can add a GridLayout from the toolbox, and view GridLayout specific properties in the properties panel 
Steps to reproduce:
1) Open an AXML file in the designer in VS or XS on Windows.
2) Search for a GridLayout in the toolbox.
3) Attempt to add
X.S. 4.0.6 (da8a8e9d) and VS
X.A. 4.6.4 (03814ac5)
How did you configure the project to target API level 14?
@Lluis I was able to repro without any specific API level set on windows, just create any template and open the included .axml file.
Peter, if you don't set an API level, that's the expected behavior. GridLayout was introduced in API level 14, so if you don't specify that your target API level is 14 or upper, you won't be able to use that widget.
Looks like this bug only exists in Visual Studio. After changing the API level  of a template I am able to properly use GridLayout in the X.S. designer. However, after loading this same project into VS 2012 I am still unable to select a GridLayout from the toolbar, or view any GridLayout specific properties in the properties pad.
Created attachment 3970 [details]
Template set to API 14
Added sample project set to API 14 for reproduction.
Using XamarIdea with Android Studio is much much better. Closing issue.