Call a UserControl method from another UserControl - wpf

Question

I am trying to call a method from a UserControl from a different UserControl. I am not able to trace the UserControl i am trying to call the method from to call the method.
I am trying to call the following method that is in AddDeal.xaml.cs
public void loadDealProducts()
{
InfoBox.Information("loadDealProducts called.", "testing");
}
I am tracing the AddDeal UserControl and trying to call the method loadDealProducts() in file AddDealProducts.xaml.cs using the following method
Window window = null;
if (sender is Window)
window = (Window)sender;
if (window == null)
window = Window.GetWindow(sender);
return window;
(window as AddDeal).loadDealProducts();
But window is returning null so i can't call the method loadDealProducts.
Instead of getting a Window using GetWindow, is there a way of getting the UserControl? I tried Window.GetUserControl and UserControl.GetUserControl but there is no such method.
sender is the DependencyObject from AddDeal.xaml.cs which i get when i click a button on AddDeal.xaml as following:
<Button Click="BtnAddProducts" CommandParameter="{Binding Path=ProductID}">Add Product</Button>
which calls the following:
private void BtnAddProducts(object sender, RoutedEventArgs e)
{
var button = (Button)sender as DependencyObject;
Window AddProductsDialog = new Window {
Title = "Add Products to Deal",
Content = new AddDealProduct(button, productID, false, 0)
};
AddProductsDialog.ShowDialog();
}
As you can see i am sending button which is a DependencyObject on AddDeal.xaml.cs/xaml
When it opens a new window AddDealProduct, it has AddDealProduct.xaml (UI file) and its .xaml.cs code-behind file. In this file i want to call a function from the calling UserControl(AddDeal).

Answer 1

Ok I solved it.
I am sending a DependencyObject sender that i get from Button Click event from source Window UserControl, to another UserControl class, as a parameter.
Then i use the sender object to resolve a UserControl and call a function in its class from a different UserControl class.
To call the function i do the following:
AddDealUserControl ownerx2 = FindVisualParent<AddDealUserControl>(sender);
ownerx2.loadDealProducts();
FindVisualParent helper class:
public static T FindVisualParent<T>(DependencyObject child)
where T : DependencyObject
{
// get parent item
DependencyObject parentObject = VisualTreeHelper.GetParent(child);
// we’ve reached the end of the tree
if (parentObject == null) return null;
// check if the parent matches the type we’re looking for
T parent = parentObject as T;
if (parent != null)
{
return parent;
}
else
{
// use recursion to proceed with next level
return FindVisualParent<T>(parentObject);
}
}
Hope it helps.