usercontrol在其他用户控件中。如何使用属性？

I made a usercontrol with several element inside (toggles, button, text box, etc...). I'm using this usercontrol inside an other one, and load this final usercontrol at runtime and on my final application. I'm a little lost with dependency property, I would like to access the properties of the very first from my application.I made a usercontrol with several element insid