ColorCanvas has 14 Binding Expression Errors

[nzain]

Describe the bug

Using the MahApps ColorCanvas results in 14 binding expressions errors when the control is displayed. VS2019 shows them in the new XAML Binding Failures tool (Debug > Windows > XAML Binding Failures). Alternatively, you add a TraceListener via PresentationTraceSources.DataBindingSource (this is what we use during development to avoid binding errors).

Steps to reproduce

Create a new WPF application (I used framework, but probably doesn't matter) and use a ColorCanvas, e.g. using the sample code from the MahApps ColorPicker Documentation.

<Window x:Class="MahAppsDemo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:MahAppsDemo"
        xmlns:mah="http://metro.mahapps.com/winfx/xaml/controls"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <mah:ColorCanvas x:Name="ColorCanvasExample"
                         SelectedColor="Blue"
                         DefaultColor="Transparent"
                         LabelAlphaChannel="Alpha"
                         LabelBlueChannel="Blue"
                         LabelGreenChannel="Green"
                         LabelRedChannel="Red" />
    </Grid>
</Window>

Expected behavior

No binding expression errors occur.

Actual behavior

14 binding expressions errors show up (see screenshot below). Using a TraceListener in combination with Debugger.Break(); calls completely kills the development experience.

Environment

MahApps.Metro version: v2.4.3
Windows build number: Win10 2004
Visual Studio: 2019 16.8.3
Target Framework: v4.7.2

Screenshots

[timunie]

@punker76 can you assign me to this issue?