WPF, Prism v2, Region in a modal dialog, add region in code behind

Question

I have a composite WPF application. In one of my modules I want to make a wizard and have the steps show up in a region so I can switch between the steps easier. Originally I had this wizard showing up in a tab region and the nested region worked fine. Now I want to make it into a modal dialog box, but after I open it the inner region never gets registared with the region manager; So I can't add my wizard steps. I was under the impression that the region manager was global, and just adding cal:RegionManager.RegionName="WizardSteps" would do it, but apparently not. If i pass the region manager to the view I might be able to use it...Does anyone know how to add a region to a ContentControl in code behind?

Accepted Answer

The problem is that regions search up the visual tree for the RegionManager attached property, and then register themselves with that manager. In the main window that's fine, but in a child window this doesn't happen.

In the Bootstrapper, after the shell is created, the following code is performed.

```
RegionManager.SetRegionManager(shell, this.Container.Resolve<IRegionManager>());
RegionManager.UpdateRegions();
```

To get the region manager to work with your child window do the same thing right after you've created the window.

EDIT

To set the region name of a control, you also set the attached property of the RegionManager, like so...

```
RegionManager.SetRegionName(control, "MyRegion");
```

However you can do this in xaml aswell. The reason why your regions in a separate window don't work is because the RegionManager needs to be set on the base window, like I showed above.

WPF, Prism v2, Region in a modal dialog, add region in code behind

Solution

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