Created Unassigned: ColorPicker control RecentColors bug [21628]

RecentColors collection on ColorPicker control cannot be bound to in version 2.3.0

It is a simple dependency property default value issue.

Solution:


```
line 211 public static readonly DependencyProperty RecentColorsProperty = DependencyProperty.Register( "RecentColors", typeof( ObservableCollection<ColorItem> ), typeof( ColorPicker ), new UIPropertyMetadata( null ) );
```

should be

```
line 211 public static readonly DependencyProperty RecentColorsProperty = DependencyProperty.Register( "RecentColors", typeof( ObservableCollection<ColorItem> ), typeof( ColorPicker ), new UIPropertyMetadata( new ObservableCollection<ColorItem>() ) );
```

and remove line 452:
```
RecentColors = new ObservableCollection<ColorItem>();
```