Color brush - Fixed gradient picker not appearing

Gradient picker - Use dialog instead of a popup window

src/Artemis.UI.Shared/Services/Interfaces/IGradientPickerService.cs

@@ -4,6 +4,6 @@ namespace Artemis.UI.Shared.Services.Interfaces
 {
     public interface IGradientPickerService : IArtemisSharedUIService
     {
-        void ShowGradientPicker(ColorGradient colorGradient);
+        void ShowGradientPicker(ColorGradient colorGradient, string dialogHost);
     }
 }