Using custom XML namespaces to reference external DLLs in Kaxaml - wpf

Question

I can get Kaxaml to load external assemblies using CLR-namespaces, that however is a pain because one needs a lot of mappings to target all the different namespaces in an assembly while the custom XmlnsDefinition on the assembly would allow one to get away with just one or a few.
When looking for a solution i obviously found this question but it only seems to cover the use of CLR-namespaces as none of the answers seemed to work for custom namespaces ("Cannot set unknown member ...").
Example:
<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:is="http://schemas.microsoft.com/expression/2010/interactions">
<!-- ... -->
<Button Content="Test">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<is:ChangePropertyAction PropertyName="IsOpen"
TargetName="popup"
Value="True" />
</i:EventTrigger>
</i:Interaction.Triggers>
</Button>
This will not work, however if you use CLRs it does:
<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:is="clr-namespace:Microsoft.Expression.Interactions;assembly=Microsoft.Expression.Interactions"
xmlns:isc="clr-namespace:Microsoft.Expression.Interactivity.Core;assembly=Microsoft.Expression.Interactions">
<!-- ... -->
<Button Content="Test">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<isc:ChangePropertyAction PropertyName="IsOpen"
TargetName="popup"
Value="True" />
</i:EventTrigger>
</i:Interaction.Triggers>
</Button>
The is namespace is not used here and i had to add a sub-namespace of the interactions assembly.
It would be ideal if the first method could be made to work.

Answer 1

So while typing this question i stumbled upon one way to use the custom namespaces: You have to make Kaxaml load the assembly at least once.
This can be done using some dummy object which references a CLR-namespace within the referenced assembly. If parsed once this loader can be discarded, of course this needs to be done every time Kaxaml is run.
e.g.
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:is="http://schemas.microsoft.com/expression/2010/interactions">
<Page.Resources>
<FrameworkElement x:Key="loader"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:is="clr-namespace:Microsoft.Expression.Interactions;assembly=Microsoft.Expression.Interactions" />
</Page.Resources>
Using snippets or the default file this can be made comparatively convenient while still not ideal so if someone knows a good fix please let me know.