Multiple dataContext for one control - MVVM

Question

I am not sure if my question header represent exactly my problem, I will do the best to explain:

I have a grid cell DataTemplate: (the grid belong to third party com

Answer 1

There are some binding properties you can use to specify a different Source for your binding than the default DataContext

The most common ones are ElementName or RelativeSource, which will find another UI element in the VisualTree so you can bind to it's properties.

For example, the following uses ElementName to tell the binding that it should use MyGridView as the binding source, and to bind to MyGridView.DataContext.OpenLinkCommand

You can also use RelativeSource in a binding to find an object further up the VisualTree of the specified object type, and use it as the binding source. This example does the same thing as the above example, except it uses RelativeSource instead of ElementName, so your GridView doesn't need to have a Name specified.

A third option is to set the binding's Source property to a static object, like this:

Based on your comment here about binding to a singleton, this would probably be the best option for you.