Xamarin Forms - Check from Custom Renderer if control has properties set from XAML

I have Custom Renderers for some controls (> Button, > Picker, > Label) and there are some common properties, which I have set in the Custom Renderers and in some cases, I want to set different properties, which I have set from XAML. But, because of Custom Renderers, the properties set in XAML are overridden. Is there any way to check if those properties are set from XAML and to avoid the common behaviour, if yes. Is there any way to achieve this behaviour?