DragAndDrop core

Lattice.IDE/MainWindow.xaml

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+<?xml version="1.0" encoding="utf-8"?>
+<Window
+    x:Class="Lattice.IDE.MainWindow"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:Lattice.IDE"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:lattice="using:Lattice.UI"
+    mc:Ignorable="d"
+    Title="Lattice.IDE">
+
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="*"/>
+        </Grid.RowDefinitions>
+
+        <!-- Меню управления Demo -->
+        <StackPanel Orientation="Horizontal" Spacing="10" Padding="10" Background="{ThemeResource SystemControlBackgroundChromeMediumLowBrush}">
+            <Button Content="Fluent UI Theme" Click="SetFluentTheme"/>
+            <Button Content="VS 2026 Theme" Click="SetVSTheme"/>
+            <TextBlock Text="Lattice IDE Demo 2026" VerticalAlignment="Center" Margin="20,0" FontWeight="Bold"/>
+        </StackPanel>
+
+        <!-- Lattice Docking Host -->
+        <lattice:LatticeDockHost x:Name="DockHost" Grid.Row="1" />
+    </Grid>
+</Window>