Set datacontext dependency property

I am trying to set datacontext of a control using the following code:

public object GlobalContext
{
    set { this.SetValue(global.DataContext as DependencyProperty , value);  }
}

Where global is a c开发者_开发知识库ontrol, in this case a stackpanel.

When I mouse over global.DataContext it says its a dependency property so I figured it should work, but I get the following error:

A 'Binding' cannot be set on the 'GlobalContext' property of type 'ResourceModuleAccessView'. A 'Binding' can only be set on a DependencyProperty of a DependencyObject.

Any way I can make this work?

Edit 1: In the user control I have:

 <StackPanel x:Name="global" Orientation="Horizontal">

and in the places where I am trying to reuse the control:

    <my:ResourceModuleAccessView  

        ControlName="Usage Monitoring"
        GlobalContext="{Binding Path=moduleAccess.GlobalAccess[ResourceModule.UsageMonitoring]}"          
          GroupContext="{Binding Path=moduleAccess.Items[ResourceModule.UsageMonitoring]}" />

Your GlobalContext class must inheirit from DependencyObject if you are going to use it as a binding target or use the SetValue method. Also, you should pass the static DataContext*Property* from FrameworkElement to setValue, thats the actual dependecy property object, you're passing the datacontext object twice. In other words the call should be

SetValue(FrameworkElement.DataContextProperty,value);

i suspect there is something else wrong than this code though, can you post your xaml?

-edit-

Thanks for adding the code, since you're binding To your class (you class is a binding target as opposed to a binding source), you must make it a DependecyObject and make your GlobalContext a DependecyProperty.

Also note that when the binding system sets a dependecy property, it doesnt use the regular clr property, it uses the DependencyProperty object directly. This means that if you want to register a call back for when the property is changed, you must do that in the call to Register when you create the DependecyProperty

The DataContext property, which is defined on FrameworkElement is a dependency property, i.e. it is a property that is 'backed' by the WPF dependency property framework. However the type of this property is object. The fact that it is a dependency property tells you how it is stored, not the type of the data stored within it.