Untitled

🔍 What this means:
You're trying to apply a UI property like HorizontalAlignment="Right" on something that is not a control, specifically on:

<ControlTheme x:Key="DockPanelTitleTemplate" TargetType="{x:Type dashboard:DashboardViewModel}">
But DashboardViewModel is a ViewModel, not a visual control like Button, StackPanel, etc.

🔥 Problem: You're declaring a <ControlTheme> with TargetType="{x:Type DashboardViewModel}" — but that's invalid.
A ControlTheme in Avalonia must target a visual control type (e.g., Button, ComboBox, ContentControl, etc.), not a ViewModel class.

✅ Solutions:
✅ Option 1: Change TargetType to an actual Control
If this block is meant to define a control’s appearance (like a ContentControl that uses a DashboardViewModel as DataContext), then change this:

<ControlTheme x:Key="DockPanelTitleTemplate" TargetType="{x:Type dashboard:DashboardViewModel}">


to:

<ControlTheme x:Key="DockPanelTitleTemplate" TargetType="ContentControl">

Then apply the template to a ContentControl that uses DashboardViewModel as its content.

Example usage:

<ContentControl Content="{Binding DashboardViewModel}" Style="{StaticResource DockPanelTitleTemplate}" />

This way, you apply that control template to a ContentControl, not to the ViewModel itself.

✅ Option 2: If this was intended as a DataTemplate, not a ControlTheme
It's likely you're trying to do this:

<DataTemplate DataType="{x:Type dashboard:DashboardViewModel}">
    <!-- your layout here -->
</DataTemplate>

So change:

<ControlTheme x:Key="DockPanelTitleTemplate" TargetType="{x:Type dashboard:DashboardViewModel}">
➡ to:

<DataTemplate DataType="{x:Type dashboard:DashboardViewModel}">

✔ This is the correct approach if you’re using ContentControl.ContentTemplate.

🔚 Summary:
What You Have	What You Likely Need
ControlTheme targeting a ViewModel	DataTemplate (if showing ViewModel)
ControlTheme for visuals	Should target a control like ContentControl, Border, etc.