How can I disable a button that is belongs to a view who is added to another as local in xaml?

I have a big *.xaml file (let's call it FromView.xaml) that creates a view composed of multiple stack panels with buttons and labels etc.. This view is displayed as a tab in the main window, among others.
I also have a summary view (lets call it ToView.xaml) as a tab, that displays certain parts from each tab. <br/>
Here is the problem, I want to add this FromView to ToView, but I don't want to show the buttons in it. I already managed to combine display FromView in ToView:

<!-- ToView.xaml -->
<Canvas MinHeight="300" MinWidth="750" Margin="2">
	<local:FromView Height="300" Width="750" IsSimplifiedView="True"/>
</Canvas>

In addition, I just need to access the visibility property of the buttons in the FromView from ToView. Here is a snippet from the FromView, so that you can see the button in it:

<StackPanel Grid.Column="2" Width="280" HorizontalAlignment="Left" >
	<Grid Background="{StaticResource QualificationBackground}">
		<Grid.ColumnDefinitions>
			<ColumnDefinition Width="120"/>
			<ColumnDefinition Width="80"/>
			<ColumnDefinition Width="20*"/>
			<ColumnDefinition Width="40"/>
		</Grid.ColumnDefinitions>
		<Grid.RowDefinitions>
			<RowDefinition/>
			<RowDefinition/>
			<RowDefinition/>
			<RowDefinition/>
			<RowDefinition/>
			<RowDefinition/>
			<RowDefinition/>
			<RowDefinition/>
			<RowDefinition/>
		</Grid.RowDefinitions>

		<!--some stuff-->

		<Label Content="SomeContent"  VerticalAlignment="Center" HorizontalAlignment="Right" Grid.Row="6" Grid.Column="0"/>
		<Button Grid.Row="6" Grid.Column="2" Grid.ColumnSpan="2" Width="60" Height="Auto" HorizontalAlignment="Left" Content="Save"/>

		<!--some stuff-->
	</Grid>
</StackPanel>

>In addition, I just need to access the visibility property of the buttons in the FromView from ToView.

I am afraid you cannot do something like this in XAML.

<local:FromView someButton.Visibility="Collapsed" />

If you want to be able to set a property of a Button that is located in FromView from ToView, you will have to define dependency or wrapper properties in the FromView class.

For example:

public class FromView : UserControl
{
    public Visibility SomeButtonVisibility
    {
       get => someButton.Visibility;
       set => someButton.Visibility = value;
  }
}

FromView.xaml:

<Button x:Name="someButton" Content="Save"/>

ToView.xaml:

<local:FromView SomeButtonVisibility="Collapsed" />

If you want to be able to bind to SomeButtonVisibility, it has to be defined as a dependency property.

Instead of creating a wrapper or dependency property for each button, you could define one property called something like "ShowButtons" that sets the Visibility property of several (or all) buttons in FromView, e.g.:

private bool _showButtons;
public bool ShowButtons
{
    get => _showButtons
            set
    {
        _showButtons = value;
        if (_showButtons)
        {
            button1.Visibility = Visibility.Visible;
            button2.Visibility = Visibility.Visible;
            ...
                }
        else
        {
            button1.Visibility = Visibility.Collapsed;
            button2.Visibility = Visibility.Collapsed;
        }
    }
}

Add a Dependency Property to the FromView UserControl. For example it can be IsButtonsVisible .
Now we can use it as following:

<Canvas MinHeight="300" MinWidth="750" Margin="2">
    <local:FromView Height="300" Width="750" IsSimplifiedView="True"
      IsButtonsVisible="Hidden"/>
</Canvas>

FromView Code Behind with the Dependency Property :

public static readonly DependencyProperty IsButtonsVisibleProperty = 
     DependencyProperty.Register(
        "IsButtonsVisible", typeof(Visibility),
         typeof(FromView)
    );

        public Visibility IsButtonsVisible
        {
            get => (Visibility)GetValue(IsButtonsVisibleProperty);
            set => SetValue(IsButtonsVisibleProperty, value);
        }

Button in the FromView will look as following:

<Button Grid.Row="6" Grid.Column="2" Grid.ColumnSpan="2" Width="60" 
   Height="Auto" HorizontalAlignment="Left" Content="Save" Visibility={Binding 
   ElementName=Parent,Path=IsButtonsVisible}/>

The "Parent" is defined as the Name of the FromView UserControl.