first commit

Views/MainWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        x:Class="OMControl.Views.MainWindow"
+        xmlns:vm="clr-namespace:OMControl.ViewModels"
+        x:DataType="vm:MainWindowViewModel"
+        Width="900" Height="600"
+        MinWidth="900" MinHeight="600"
+        MaxWidth="900" MaxHeight="600"
+        CanResize="False"
+        Title="Data Entry Form">
+
+  <DockPanel Margin="16" LastChildFill="True">
+
+<Border DockPanel.Dock="Top"
+        Margin="0,0,0,12"
+        Padding="10"
+        BorderBrush="Gray"
+        BorderThickness="1"
+        CornerRadius="6">
+  <StackPanel Spacing="8">
+    <TextBlock Text="Serial Port" FontWeight="Bold" Margin="0,0,0,6"/>
+
+    <StackPanel Orientation="Horizontal" Spacing="8">
+      <ComboBox Width="120"
+                ItemsSource="{Binding AvailablePorts}"
+                SelectedItem="{Binding SelectedPort}" />
+      <Button Content="Connect" Command="{Binding ConnectCommand}" />
+      <Button Content="Disconnect" Command="{Binding DisconnectCommand}" />
+    </StackPanel>
+
+    <StackPanel Orientation="Horizontal" Spacing="8">
+      <TextBox Width="200" Text="{Binding SendData}" Watermark="Data to send"/>
+      <Button Content="Send" Command="{Binding SendCommand}" />
+    </StackPanel>
+
+    <TextBox Height="120" AcceptsReturn="True" IsReadOnly="True" Text="{Binding ReceivedData}" />
+  </StackPanel>
+</Border>
+
+
+    <StackPanel DockPanel.Dock="Top" Orientation="Horizontal" Margin="0,0,0,12" Spacing="8">
+      <Button Content="Clear" Command="{Binding ClearCommand}" />
+      <Button Content="Refresh COM" Command="{Binding RefreshPortsCommand}" />
+    </StackPanel>
+
+    <ScrollViewer>
+      <Grid ColumnDefinitions="180,*" RowDefinitions="Auto,Auto,Auto"
+            RowSpacing="8" ColumnSpacing="10">
+        <TextBlock Grid.Row="0" Grid.Column="0" Text="Field 01" VerticalAlignment="Center"/>
+        <TextBox   Grid.Row="0" Grid.Column="1" Text="{Binding Field01}"/>
+        <TextBlock Grid.Row="1" Grid.Column="0" Text="Field 02" VerticalAlignment="Center"/>
+        <TextBox   Grid.Row="1" Grid.Column="1" Text="{Binding Field02}"/>
+        <TextBlock Grid.Row="2" Grid.Column="0" Text="Field 03" VerticalAlignment="Center"/>
+        <TextBox   Grid.Row="2" Grid.Column="1" Text="{Binding Field03}"/>
+      </Grid>
+    </ScrollViewer>
+
+  </DockPanel>
+</Window>

Views/MainWindow.axaml.cs

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+using Avalonia.Controls;
+
+namespace OMControl.Views;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+}