How to insert button into Grid from ViewModel C# class in windows 8.1 store app

Question

I can insert button to a grid control from the code behind file as

var fElem = new Button();                 

fElem.Content = "button text";
bgGrid.Children.Add(fElem); // bgGrid defined in xaml

How can I add the same button to the grid from the view model class?

Answer 1

In code-behind of the xaml page (xaml.cs) you need to publicly expose the grid

public Grid MyGrid => bgGrid;

Then you can get access to it from your ViewModel like so:

Frame rootFrame = Window.Current.Content as Frame;
var page = rootFrame.Content as YourPageClassName;
var fElem = new Button();                 
fElem.Content = "button text";
page.MyGrid.Children.Add(fElem); 

However, this is not MVVM at all.