how i used createFromXaml method parametre as xaml file

I know that we can create a xaml controls dynamically by using CreateFromXaml method. But The CreateFromXaml method takes a parameter as xaml control syntax but is it possible to send parameter as a xaml file name. or if any other way how i cretae dynamic controls by using xaml file . Here i will Explain my problem in detail: I have one Main.xaml file in this file i creted a one canvas in which i want to show different xaml files and two buttons say first and second . When i clicked on first button then myfirst.xaml file is loaded in canvas ,and when i clicked on second button thensecond.xamlis loaded in canvas If any solution for this please let me know.