Dynamically add child expander - wpf

Question

Is there a way to create child expanders like this xaml bellow, at run-time?
<Expander Header="Building" IsExpanded="True">
<StackPanel>
<Expander Header="Sales">
<StackPanel>
<TextBlock>6100</TextBlock>
<TextBlock>6101</TextBlock>
<TextBlock>6111</TextBlock>
<TextBlock>6150</TextBlock>
</StackPanel>
</Expander>
<Expander Header="Director">
<StackPanel>
<TextBlock>6102</TextBlock>
<TextBlock>6113</TextBlock>
</StackPanel>
</Expander>
</StackPanel>
</Expander>

Answer 1

Set a name for first StackPanel (MainStackPanel) under the top Expander.
// Add new expander, stack panel and text block.
var newExpander = new Expander {Name = "NewExpander", Header = "New Expander"};
var newstackPanel = new StackPanel {Name = "NewExpanderStackPanel"};
var newtextBlock = new TextBlock {Text = "777"};
// Add above items as children.
newstackPanel.Children.Add(newtextBlock);
newExpander.Content = newstackPanel;
MainStackPanel.Children.Add(newExpander);

Answer 2

The best way would probably be to use data binding. I'm assuming you have some data structure that describes which expanders you want to create. Let's assume we have:
class Building
{
public List<Item> Items { get; }
public string Name { get; }
}
class Item
{
public int Number { get; }
}
In our user control, we'll set the DataContext to a list of Buildings (e.g. in the constructor):
DataContext = GetListOfBuildings();
Then we'd use two nested ItemsControls with templates to create the controls at runtime:
<Expander Header="Building"
IsExpanded="True">
<ItemsControl ItemsSource="{Binding}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Expander Header="{Binding Name}">
<ItemsControl ItemsSource="{Binding Items}"
DisplayMemberPath="Number" />
</Expander>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Expander>
This way you would not need to create controls in C#, which is more cumbersome in WPF.

Answer 3

Not quite sure about what you want to achieve.
If I understand correctly, you can save your code in a .xaml file as resource and use application to load it. Then, add the object to the visual tree.
var expander = (Expander) Application.LoadComponent(new Uri("UriToTheXamlFile"));
control.AddChild(expander);