UIApplication.DoDragDrop() in XAML

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Continuing my journey into trying to understand xaml, I’ve been playing around with trying to implement Revit’s dragdrop method. Using this series of posts as a reference, I’ve tried implementing a super simple version but it isn’t working. I think it must be because the x:Class cannot be implemented in Ironpython as it can in C# (as far as I’ve been able to understand). Is there a way to use dragdrop with xaml in pyrevit? I tried both form.Show() (dragging crashes revit) and form.ShowDialog() (dragging shows the circle with a slash cursor).

Here is the code. As a test, I was able to get it working with winforms just fine, but I really want to be able to use xaml so I can implement it in my dockable panels.

Xaml:

<Window 
       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
       x:Name="title"
       Title="DragDropTest" Width="300"  Height="300"  ResizeMode="CanResize"
       WindowStartupLocation="CenterScreen">
    <StackPanel Margin="10">
        <Label Content="DRAG THIS TO TEST"
        MouseMove = "label_MouseMove"
        Tag="C:\Users\kfaulkner\Downloads\MicrosoftTeams-image (2).png"/>
    </StackPanel>
</Window>

Python code-behind:

import Autodesk.Revit.UI as UI
import clr
clr.AddReference('IronPython.Wpf')
import wpf
from System import Windows
import os

lib = os.path.dirname(__file__)
xamlfile = os.path.join(lib, 'DragDrop.xaml')

class DropHandler(UI.IDropHandler):
    def Execute(self, document, data):
        print str(data)

class DragDropTest(Windows.Window):
    def __init__(self):
        wpf.LoadComponent(self, xamlfile)
    
    def label_MouseMove(self, sender, args):
        dropHandler = DropHandler()
        UI.UIApplication.DoDragDrop(sender.Tag, dropHandler)

dragdropform = DragDropTest()
dragdropform.ShowDialog()

Winforms version that works:

import Autodesk.Revit.DB as DB
import Autodesk.Revit.UI as UI
import clr
clr.AddReference('System.Windows.Forms')
clr.AddReference('System.Drawing')
import System

class DropHandler(UI.IDropHandler):
    def Execute(self, document, data):
        print str(data)

class DragDropWinform(System.Windows.Forms.Form):
    def __init__(self):
        self.InitializeComponent()
    
    def InitializeComponent(self):
        self._label1 = System.Windows.Forms.Label()
        self.SuspendLayout()

        self._label1.Location = System.Drawing.Point(13, 24)
        self._label1.Name = "label1"
        self._label1.Size = System.Drawing.Size(259, 23)
        self._label1.TabIndex = 0
        self._label1.Tag = "\"C:\\Users\\kfaulkner\\Downloads\\MicrosoftTeams-image (2).png\""
        self._label1.Text = "DRAG THIS TO TEST"
        self._label1.MouseMove += self.Label1MouseMove

        self.ClientSize = System.Drawing.Size(284, 65)
        self.Controls.Add(self._label1)
        self.Name = "MainForm"
        self.Text = "DragDropTest"
        self.ResumeLayout(False)

    def Label1MouseMove(self, sender, e):
        dropHandler = DropHandler()
        UI.UIApplication.DoDragDrop(sender.Tag, dropHandler)

dragdropform = DragDropWinform()
System.Windows.Forms.Application.Run(dragdropform)