MVVM without xaml (binding issues)

Hi, I'm playing around with some code, trying to achieve the same thing with what I have already done with xaml, but now without it. So first of all I have simply created two .cs files one customersViewP.cs and the other customersViewP.gui.cs. These are partial classes implementing the ContentPage class. The gui file has only the InitializeComponent function implemented where all gui code takes place. The customersViewP.cs should be a complete copy of the code-behind file customersView.xaml.cs.

That being said I have a customersViewModel.cs which both of these implementations (xaml and not xaml) should use, and it is here I have encountered into binding issues for the non-xaml implementation. I am asking as I have found poor and little examples for this.

The code-behind (customersView.xaml.cs) and customersViewP.cs have the following constructor:

public CustomersViewP ()
{
    InitializeComponent ();
    ThemeManager.ThemeName = Themes.Light;
    BindingContext = new CustomersViewModel ();
}

Lets being with the viewModel (CustomersViewModel):

...
private string searchTerm;
public string SearchTerm {
    get { return searchTerm; }
    set {
        if (searchTerm != value) {
            searchTerm = value;
            OnPropertyChanged ("SearchTerm");
        }
    }
}

public ObservableCollection<Customer> Customers {
    get { return CustomerDataManager.GetInstance ().GetCustomers (); } 
}

public ICommand SearchCustomerCommand { get; set; }
...

These are the properties I have bound in the xaml version like this

...
<SearchBar
    Text="{Binding SearchTerm}" 
    Placeholder="Search..."
    HorizontalOptions="Center" 
    SearchCommand="{Binding SearchCustomerCommand}"/>
...
<dxGrid:GridControl
    x:Name="grid"
    ItemsSource="{Binding Customers}"
    ColumnHeadersVisibility="false"
    ...
...

So how do I bind these with code? I have managed to use the event handler instead of the command property,
but out of curiosity, how does one bind a command in code to get this to work?

...
SearchBar customerSearchBar = new SearchBar ();
customerSearchBar.Text = ""; // new Binding() ??
customerSearchBar.Placeholder = "Search...";
customerSearchBar.HorizontalOptions = LayoutOptions.Center;
//customerSearchBar.SearchCommand = new Binding (); // ??
//customerSearchBar.SearchButtonPressed += OnSearchBarButtonPressed;
customerSearchBar.SetBinding (SearchBar.SearchCommandParameterProperty, new Binding ("SearchCustomerCommand"));

...

GridControl gridControl = new GridControl ();
gridControl.ItemsSource = new Binding("Customers"); // ??
gridControl.ColumnHeadersVisibility = false;
...

I have also a dataTemplate that looks like this in xaml (dxGrid is part of devexpress gridcontrol)

<dxGrid:TemplateColumn.DisplayTemplate>
    <DataTemplate>
        <Grid BindingContext="{Binding Source}">
                    <Grid.RowDefinitions>
                        <RowDefinition Height="*"/>
                        <RowDefinition Height="*"/>
            </Grid.RowDefinitions>
                    <Label Text="{Binding FirstName}" Font="Bold, 20" Grid.Row="0" />
                    <Label Text="{Binding Email}" Font="Normal" Grid.Row="1"/>
        </Grid>
    </DataTemplate>
</dxGrid:TemplateColumn.DisplayTemplate>

and like this in code, which I havn't got to test as I have not managed to get the binding to work.

templateColumn.DisplayTemplate = new DataTemplate (() => {

    Grid grid = new Grid ();
    grid.BindingContext = new Binding("Source"); **// ??**
    grid.RowDefinitions.Add (new RowDefinition() { Height = GridLength.Auto });
    grid.RowDefinitions.Add (new RowDefinition() { Height = GridLength.Auto });

    Label firstNameLabel = new Label ();
    firstNameLabel.SetBinding (Label.TextProperty, new Binding("FirstName"));
    //firstNameLabel.Text = ""; **// ??**
    firstNameLabel.FontAttributes = FontAttributes.Bold;
    firstNameLabel.FontSize = 20;

    Label emailLabel = new Label ();
    //emailLabel.Text = ""; **// ??**
    emailLabel.SetBinding(Label.TextProperty, new Binding("Email"));

    grid.Children.Add (firstNameLabel);
    grid.Children.Add (emailLabel);

    return grid;
});