diff --git a/src/Ursa.Themes.Semi/Compatibles/Icon.axaml b/src/Ursa.Themes.Semi/Compatibles/Icon.axaml
index 8380cfc..72f1457 100644
--- a/src/Ursa.Themes.Semi/Compatibles/Icon.axaml
+++ b/src/Ursa.Themes.Semi/Compatibles/Icon.axaml
@@ -67,4 +67,7 @@
     <StreamGeometry x:Key="SemiIconMoon">
         M12 23a11 11 0 1 0 0-22 11 11 0 0 0 0 22Zm5-8c.48 0 .94-.05 1.39-.14a7 7 0 1 1-7.78-9.72A7 7 0 0 0 17 15Z
     </StreamGeometry>
+    <StreamGeometry x:Key="SemiIconTick">
+        M21.35 4.27c.68.47.86 1.4.38 2.08l-10 14.5a1.5 1.5 0 0 1-2.33.17l-6.5-7a1.5 1.5 0 0 1 2.2-2.04l5.23 5.63 8.94-12.96a1.5 1.5 0 0 1 2.08-.38Z
+    </StreamGeometry>
 </ResourceDictionary>
\ No newline at end of file
diff --git a/src/Ursa.Themes.Semi/Controls/AutoCompleteBox.axaml b/src/Ursa.Themes.Semi/Controls/AutoCompleteBox.axaml
index c89ec6f..8daf73f 100644
--- a/src/Ursa.Themes.Semi/Controls/AutoCompleteBox.axaml
+++ b/src/Ursa.Themes.Semi/Controls/AutoCompleteBox.axaml
@@ -22,12 +22,13 @@
                         Watermark="{TemplateBinding Watermark}" />
                     <Popup
                         Name="PART_Popup"
-                        MinWidth="{Binding Bounds.Width, RelativeSource={RelativeSource TemplatedParent}}"
                         MaxHeight="{TemplateBinding MaxDropDownHeight}"
                         IsLightDismissEnabled="True"
                         PlacementTarget="{TemplateBinding}">
                         <Border
+                            MinWidth="{Binding Bounds.Width, RelativeSource={RelativeSource TemplatedParent}}"
                             Margin="{DynamicResource AutoCompleteBoxPopupMargin}"
+                            Padding="{DynamicResource AutoCompleteBoxPopupPadding}"
                             HorizontalAlignment="Stretch"
                             Background="{DynamicResource AutoCompleteBoxPopupBackground}"
                             BorderBrush="{DynamicResource AutoCompleteBoxPopupBorderBrush}"
diff --git a/src/Ursa.Themes.Semi/Controls/MultiComboBox.axaml b/src/Ursa.Themes.Semi/Controls/MultiComboBox.axaml
index d69b19e..f3ffe12 100644
--- a/src/Ursa.Themes.Semi/Controls/MultiComboBox.axaml
+++ b/src/Ursa.Themes.Semi/Controls/MultiComboBox.axaml
@@ -2,7 +2,16 @@
     xmlns="https://github.com/avaloniaui"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:u="https://irihi.tech/ursa">
-    <!--  Add Resources Here  -->
+    <Design.PreviewWith>
+        <StackPanel Height="300">
+            <u:MultiComboBox Width="300">
+                <u:MultiComboBoxItem Content="Option 1" />
+                <u:MultiComboBoxItem Content="Option 2" />
+                <u:MultiComboBoxItem Content="Option 3" />
+                <u:MultiComboBoxItem Content="Option 4" />
+            </u:MultiComboBox>
+        </StackPanel>
+    </Design.PreviewWith>
     <ControlTheme x:Key="{x:Type u:MultiComboBox}" TargetType="u:MultiComboBox">
         <Setter Property="Focusable" Value="True" />
         <Setter Property="VerticalAlignment" Value="Top" />
@@ -10,7 +19,7 @@
         <Setter Property="CornerRadius" Value="{DynamicResource ComboBoxSelectorCornerRadius}" />
         <Setter Property="BorderBrush" Value="{DynamicResource ComboBoxSelectorBorderBrush}" />
         <Setter Property="HorizontalAlignment" Value="Left" />
-        <Setter Property="MaxDropdownHeight" Value="300" />
+        <Setter Property="MaxDropDownHeight" Value="300" />
         <Setter Property="MaxSelectionBoxHeight" Value="270" />
         <Setter Property="MinHeight" Value="32" />
         <Setter Property="Padding" Value="12 4" />
@@ -42,18 +51,18 @@
                                     IsVisible="{TemplateBinding InnerLeftContent,
                                                                 Converter={x:Static ObjectConverters.IsNotNull}}" />
                                 <TextBlock
-                                  x:Name="PlaceholderTextBlock"
-                                  Grid.Column="1"
-                                  Grid.ColumnSpan="2"
-                                  Margin="{TemplateBinding Padding}"
-                                  TextTrimming="CharacterEllipsis"
-                                  HorizontalAlignment="Left"
-                                  VerticalAlignment="Center"
-                                  Foreground="{TemplateBinding Foreground}"
-                                  IsHitTestVisible="False"
-                                  IsVisible="False"
-                                  Opacity="0.3"
-                                  Text="{TemplateBinding Watermark}" />
+                                    x:Name="PlaceholderTextBlock"
+                                    Grid.Column="1"
+                                    Grid.ColumnSpan="2"
+                                    Margin="{TemplateBinding Padding}"
+                                    TextTrimming="CharacterEllipsis"
+                                    HorizontalAlignment="Left"
+                                    VerticalAlignment="Center"
+                                    Foreground="{TemplateBinding Foreground}"
+                                    IsHitTestVisible="False"
+                                    IsVisible="False"
+                                    Opacity="0.3"
+                                    Text="{TemplateBinding Watermark}" />
                                 <ScrollViewer
                                     Grid.Column="1"
                                     Grid.ColumnSpan="2"
@@ -102,22 +111,23 @@
                             </Grid>
                         </Border>
                         <Popup
-                            MinWidth="{Binding #PART_RootGrid.Bounds.Width}"
-                            MaxHeight="{TemplateBinding MaxDropdownHeight}"
+                            MaxHeight="{TemplateBinding MaxDropDownHeight}"
                             IsLightDismissEnabled="True"
                             IsOpen="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsDropDownOpen, Mode=TwoWay}"
                             PlacementTarget="PART_RootGrid">
                             <Border
-                                Margin="{DynamicResource ComboBoxPopupBorderMargin}"
                                 HorizontalAlignment="Stretch"
+                                MinWidth="{Binding Bounds.Width, RelativeSource={RelativeSource TemplatedParent}}"
+                                Margin="{DynamicResource ComboBoxPopupBorderMargin}"
+                                Padding="{DynamicResource ComboBoxPopupBorderPadding}"
                                 Background="{DynamicResource ComboBoxPopupBackground}"
                                 BorderBrush="{DynamicResource ComboBoxPopupBorderBrush}"
                                 BorderThickness="{DynamicResource ComboBoxPopupBorderThickness}"
                                 BoxShadow="{DynamicResource ComboBoxPopupBoxShadow}"
-                                CornerRadius="6">
+                                CornerRadius="{DynamicResource ComboBoxPopupBoxCornerRadius}">
                                 <DockPanel LastChildFill="True">
-                                    <ContentPresenter Content="{TemplateBinding PopupInnerTopContent}" DockPanel.Dock="Top"/>
-                                    <ContentPresenter Content="{TemplateBinding PopupInnerBottomContent}" DockPanel.Dock="Bottom"/>
+                                    <ContentPresenter Content="{TemplateBinding PopupInnerTopContent}" DockPanel.Dock="Top" />
+                                    <ContentPresenter Content="{TemplateBinding PopupInnerBottomContent}" DockPanel.Dock="Bottom" />
                                     <ScrollViewer
                                         Grid.IsSharedSizeScope="True"
                                         HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}"
@@ -208,7 +218,7 @@
     </ControlTheme>
 
     <ControlTheme x:Key="{x:Type u:MultiComboBoxItem}" TargetType="u:MultiComboBoxItem">
-        <Setter Property="Padding" Value="8,0,0,0" />
+        <Setter Property="Padding" Value="12 8" />
         <Setter Property="HorizontalAlignment" Value="Stretch" />
         <Setter Property="VerticalAlignment" Value="Top" />
         <Setter Property="Cursor" Value="Hand" />
@@ -220,6 +230,7 @@
             <ControlTemplate TargetType="u:MultiComboBoxItem">
                 <Border
                     x:Name="RootBorder"
+                    Padding="{TemplateBinding Padding}"
                     Background="{TemplateBinding Background}"
                     BorderBrush="{TemplateBinding BorderBrush}"
                     BorderThickness="{TemplateBinding BorderThickness}"
@@ -231,20 +242,18 @@
                             Width="{DynamicResource CheckBoxBoxGlyphWidth}"
                             Height="{DynamicResource CheckBoxBoxGlyphHeight}"
                             Theme="{DynamicResource InnerPathIcon}"
-                            Margin="8,0"
+                            Margin="0 0 8 0"
                             VerticalAlignment="Center"
-                            Data="{DynamicResource CheckBoxCheckGlyph}"
+                            Data="{DynamicResource SemiIconTick}"
                             Opacity="0" />
                         <ContentPresenter
                             x:Name="ContentPresenter"
                             Grid.Column="1"
-                            Margin="{TemplateBinding Padding}"
                             HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                             VerticalAlignment="Center"
                             Content="{TemplateBinding Content}"
                             ContentTemplate="{TemplateBinding ContentTemplate}"
-                            IsVisible="{TemplateBinding Content,
-                                                        Converter={x:Static ObjectConverters.IsNotNull}}"
+                            IsVisible="{TemplateBinding Content, Converter={x:Static ObjectConverters.IsNotNull}}"
                             RecognizesAccessKey="True"
                             TextWrapping="Wrap" />
                     </Grid>
diff --git a/src/Ursa.Themes.Semi/Controls/TreeComboBox.axaml b/src/Ursa.Themes.Semi/Controls/TreeComboBox.axaml
index 09c273b..e82a921 100644
--- a/src/Ursa.Themes.Semi/Controls/TreeComboBox.axaml
+++ b/src/Ursa.Themes.Semi/Controls/TreeComboBox.axaml
@@ -5,7 +5,20 @@
     xmlns:converters1="clr-namespace:Ursa.Converters;assembly=Ursa"
     xmlns:iri="https://irihi.tech/shared"
     xmlns:u="https://irihi.tech/ursa">
-    <!--  Add Resources Here  -->
+    <Design.PreviewWith>
+        <StackPanel Height="300">
+            <u:TreeComboBox
+                Watermark="Please Select"
+                Width="300"
+                MaxHeight="200">
+                <u:TreeComboBoxItem Header="Option 1">
+                    <u:TreeComboBoxItem Header="Inner Option 1" />
+                    <u:TreeComboBoxItem Header="Inner Option 2" />
+                </u:TreeComboBoxItem>
+                <u:TreeComboBoxItem Header="Option 2" />
+            </u:TreeComboBox>
+        </StackPanel>
+    </Design.PreviewWith>
 
     <converters:MarginMultiplierConverter
         x:Key="LeftMarginConverter"
@@ -100,7 +113,6 @@
                     <Popup
                         Name="{x:Static iri:PartNames.PART_Popup}"
                         Grid.Column="0"
-                        MinWidth="{Binding Bounds.Width, RelativeSource={RelativeSource TemplatedParent}}"
                         MaxHeight="{TemplateBinding MaxDropDownHeight}"
                         ClipToBounds="False"
                         InheritsTransform="True"
@@ -110,12 +122,14 @@
                         WindowManagerAddShadowHint="False">
                         <Border
                             Name="PopupBorder"
+                            MinWidth="{Binding Bounds.Width, RelativeSource={RelativeSource TemplatedParent}}"
                             Margin="{DynamicResource ComboBoxPopupBorderMargin}"
+                            Padding="{DynamicResource ComboBoxPopupBorderPadding}"
                             Background="{DynamicResource ComboBoxPopupBackground}"
                             BorderBrush="{DynamicResource ComboBoxPopupBorderBrush}"
                             BorderThickness="{DynamicResource ComboBoxPopupBorderThickness}"
                             BoxShadow="{DynamicResource ComboBoxPopupBoxShadow}"
-                            CornerRadius="6">
+                            CornerRadius="{DynamicResource ComboBoxPopupBoxCornerRadius}">
                             <DockPanel LastChildFill="True">
                                 <ContentPresenter
                                     Name="PART_PopupHeader"
diff --git a/src/Ursa/Controls/ComboBox/MultiComboBox.cs b/src/Ursa/Controls/ComboBox/MultiComboBox.cs
index 032db06..a6adb84 100644
--- a/src/Ursa/Controls/ComboBox/MultiComboBox.cs
+++ b/src/Ursa/Controls/ComboBox/MultiComboBox.cs
@@ -30,9 +30,9 @@ public class MultiComboBox : SelectingItemsControl, IInnerContentControl, IPopup
     public static readonly StyledProperty<bool> IsDropDownOpenProperty =
         ComboBox.IsDropDownOpenProperty.AddOwner<MultiComboBox>();
 
-    public static readonly StyledProperty<double> MaxDropdownHeightProperty =
+    public static readonly StyledProperty<double> MaxDropDownHeightProperty =
         AvaloniaProperty.Register<MultiComboBox, double>(
-            nameof(MaxDropdownHeight));
+            nameof(MaxDropDownHeight));
 
     public static readonly StyledProperty<double> MaxSelectionBoxHeightProperty =
         AvaloniaProperty.Register<MultiComboBox, double>(
@@ -89,10 +89,10 @@ public class MultiComboBox : SelectingItemsControl, IInnerContentControl, IPopup
         set => SetValue(IsDropDownOpenProperty, value);
     }
 
-    public double MaxDropdownHeight
+    public double MaxDropDownHeight
     {
-        get => GetValue(MaxDropdownHeightProperty);
-        set => SetValue(MaxDropdownHeightProperty, value);
+        get => GetValue(MaxDropDownHeightProperty);
+        set => SetValue(MaxDropDownHeightProperty, value);
     }
 
     public double MaxSelectionBoxHeight