Learn to Develop with Microsoft Developer Network. Any Developer. Any App. Datagrid In Windows Mobile Centre' title='Datagrid In Windows Mobile Centre' />How do I use WPF bindings with Relative. Source If an element is not part of the visual tree, then Relative. Source will never work. UpdateStar is compatible with Windows platforms. UpdateStar has been tested to meet all of the technical requirements to be compatible with Windows 10, 8. Windows 8. How do I use RelativeSource with WPF bindings and what are the different usecases Microsoft Silverlight library, learning resources, downloads, support, and community. Evaluate and find out how to install and use Silverlight. In this case, you need to try a different technique, pioneered by Thomas Levesque. He has the solution on his blog under WPF How to bind to data when the Data. Context is not inherited. And it works absolutely brilliantly In the unlikely event that his blog is down, Appendix A contains a mirror copy of his article. Please do not comment here, please comment directly on his blog post. The Data. Context property in WPF is extremely handy, because it is automatically inherited by all children of the element where you assign it therefore you dont need to set it again on each element you want to bind. However, in some cases the Data. Context is not accessible it happens for elements that are not part of the visual or logical tree. It can be very difficult then to bind a property on those elementsLets illustrate with a simple example we want to display a list of products in a Data. Grid. In the grid, we want to be able to show or hide the Price column, based on the value of a Show. Price property exposed by the View. Model. The obvious approach is to bind the Visibility of the column to the Show. Smoking Crack Using Tin Foil. Price property lt Data. Grid. Text. Column HeaderPrice BindingBinding Price Is. Read. OnlyFalse. VisibilityBinding Show. Price. ConverterStatic. KB/grid/DataGridZen/colorcol.jpg' alt='Datagrid In Windows Mobile Centre' title='Datagrid In Windows Mobile Centre' />Find the latest resources for developers. On Microsoft Developer Network, you can learn to build apps for the web, Windows Phone, and Xbox. Resource visibility. Converter. Unfortunately, changing the value of Show. Price has no effect, and the column is always visible why If we look at the Output window in Visual Studio, we notice the following line System. Windows. Data Error 2 Cannot find governing Framework. Element or Framework. Content. Element for target element. Binding. Expression PathShow. Price Data. Itemnull target element is Data. Grid. Text. Column Hash. Code3. 26. 85. 25. Visibility type VisibilityThe message is rather cryptic, but the meaning is actually quite simple WPF doesnt know which Framework. Element to use to get the Data. Context, because the column doesnt belong to the visual or logical tree of the Data. Grid. We can try to tweak the binding to get the desired result, for instance by setting the Relative. Source to the Data. Grid itself lt Data. Grid. Text. Column HeaderPrice BindingBinding Price Is. Read. OnlyFalse. VisibilityBinding Data. Context. Show. Price. ConverterStatic. Resource visibility. Converter. Relative. SourceRelative. Source Find. Ancestor, Ancestor. TypeData. Grid. Or we can add a Check. Box bound to Show. Price, and try to bind the column visibility to the Is. Checked property by specifying the element name lt Data. Grid. Text. Column HeaderPrice BindingBinding Price Is. Read. OnlyFalse. VisibilityBinding Is. Checked. ConverterStatic. Resource visibility. Converter. Element. Namechk. Show. Price. But none of these workarounds seems to work, we always get the same resultAt this point, it seems that the only viable approach would be to change the column visibility in code behind, which we usually prefer to avoid when using the MVVM pattern But Im not going to give up so soon, at least not while there are other options to consider The solution to our problem is actually quite simple, and takes advantage of the Freezable class. The primary purpose of this class is to define objects that have a modifiable and a read only state, but the interesting feature in our case is that Freezable objects can inherit the Data. Context even when theyre not in the visual or logical tree. I dont know the exact mechanism that enables this behavior, but were going to take advantage of it to make our binding workThe idea is to create a class I called it Binding. Proxy for reasons that should become obvious very soon that inherits Freezable and declares a Data dependency property public class Binding. Proxy Freezable. Overrides of Freezable. Freezable Create. Instance. Core. Binding. Proxy. Data. get return objectGet. ValueData. Property. Set. ValueData. Property, value. Using a Dependency. Property as the backing store for Data. This enables animation, styling, binding, etc. Dependency. Property Data. Property. Dependency. Property. RegisterData, typeofobject, typeofBinding. Proxy, new UIProperty. Metadatanull. We can then declare an instance of this class in the resources of the Data. Grid, and bind the Data property to the current Data. Context lt Data. Grid. Resources. Binding. Proxy x Keyproxy DataBinding. Data. Grid. Resources. The last step is to specify this Binding. Proxy object easily accessible with Static. Resource as the Source for the binding lt Data. Grid. Text. Column HeaderPrice BindingBinding Price Is. Read. OnlyFalse. VisibilityBinding Data. Show. Price. ConverterStatic. Resource visibility. Converter. SourceStatic. Resource proxy. Note that the binding path has been prefixed with Data, since the path is now relative to the Binding. Proxy object. The binding now works correctly, and the column is properly shown or hidden based on the Show.