refactoring

UI/MainWindow.axaml

@@ -0,0 +1,42 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:MercuryConverter.UI"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+
+        x:Class="MercuryConverter.UI.MainWindow"
+        Title="MercuryConverter"
+        Width="1024" Height="800"
+        MinWidth="800" MinHeight="600"
+        ExtendClientAreaToDecorationsHint="True"
+>
+    <!-- Components -->
+    <Panel>
+        <!-- Banner -->
+        <StackPanel>
+            <UserControl Background="{DynamicResource SystemAltHighColor}" Height="86"/>
+        </StackPanel>
+        <StackPanel HorizontalAlignment="Right">
+            <Image Height="86" Source="{DynamicResource BannerBitmap}"/>
+        </StackPanel>
+
+        <DockPanel>
+            
+            <Menu Name="MenuBar" DockPanel.Dock="Top">
+                <MenuItem Header="File">
+                    <MenuItem Header="Open Data Folder..." />
+                </MenuItem>
+            </Menu>
+
+            <TabControl>
+                <TabItem Header="selection">
+                    <UserControl Name="SelectionControl"/>
+                </TabItem>
+
+                <TabItem Header="export">
+                </TabItem>
+            </TabControl>
+        </DockPanel>
+    </Panel>
+</Window>