Edited Issue: ColorPicker: Closes dropdown canvas panel after mouse down if color picker using in ListView [21110]

__Toolkin 2.2.1__
Dropdown panel closing after MouseDown in ColorCanvas. =|

```
<ListView.View>
<GridView>
<GridViewColumn Width="50" Header="sadasd">
<GridViewColumn.CellTemplate>
<DataTemplate>
<xctk:ColorPicker ColorMode="ColorCanvas"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
```