Question

Using the IWindowManager of Caliburn.Micro, is it possible to create a borderless window using the ShowWindow method?

In this case, the content of the Window is generated from a UserControl. And Caliburn.Micro will create a Window to host the UserControl.

Answer 1

EDIT: The status today:

With the current Caliburn.Micro v1.2 (July 20, 2011) release it’s not possible to set properties on the created window. You can inherit from the WindowManager and override the CreateWindow method:

public class BorderlessWindowManager : WindowManager
{
    protected override Window CreateWindow(object rootModel, bool isDialog, 
       object context)
    {
        var window = base.CreateWindow(rootModel, isDialog, context);
        window.WindowStyle = WindowStyle.None;
        window.ShowInTaskbar = false;
        window.AllowsTransparency = true;
        window.Background = new SolidColorBrush(Colors.Transparent);
        return window;
    }
}

When the new version released:

Yes it’s possible, with the settings parameter:

public interface IWindowManager
{
    //...
    void ShowWindow(object rootModel, object context = null, 
         IDictionary<string, object> settings = null);
}

Caliburn.Micro will use this dictionary as [property name; property value] bag and set them on the created window with reflection.
I’ve never created a borderless window but based on this artice something like this should work:

windowManger.ShowWindow(viewModel, 
    settings: new Dictionary<string, object>
    {
        { "WindowStyle", WindowStyle.None},
        { "ShowInTaskbar", false},
        { "AllowsTransparency", true},
        { "Background", new SolidColorBrush(Colors.Transparent)},
    });