Добавлен проект UI

Lattice.UI/Themes/Styles/LatticeSplitter.xaml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ResourceDictionary
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:Lattice.UI.Controls">
+    
+    <Style TargetType="local:LatticeSplitter">
+        <Setter Property="Background" Value="Transparent" />
+        <Setter Property="Template">
+            <Setter.Value>
+                <ControlTemplate TargetType="local:LatticeSplitter">
+                    <Grid Background="{TemplateBinding Background}">
+                        <!-- PART_Thumb — это невидимая или тонкая область, которую тянет пользователь -->
+                        <Thumb x:Name="PART_Thumb">
+                            <Thumb.Template>
+                                <ControlTemplate TargetType="Thumb">
+                                    <Grid Background="Transparent">
+                                        <!-- Визуальная линия разделителя -->
+                                        <Rectangle Fill="{ThemeResource SystemControlForegroundBaseLowBrush}" 
+                                           MinWidth="1" MinHeight="1" HorizontalAlignment="Center"/>
+                                    </Grid>
+                                </ControlTemplate>
+                            </Thumb.Template>
+                        </Thumb>
+                    </Grid>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+    </Style>
+</ResourceDictionary>