add ButtonGroup

replaced RadioButton with ButtonGroup

src/Shared/HandyControl_Shared/Controls/Other/ButtonGroup.cs

@@ -0,0 +1,42 @@
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Controls.Primitives;
+using HandyControl.Tools;
+
+namespace HandyControl.Controls
+{
+    public class ButtonGroup : ItemsControl
+    {
+        protected override bool IsItemItsOwnContainerOverride(object item) => item is Button || item is RadioButton || item is ToggleButton;
+
+        public static readonly DependencyProperty OrientationProperty = DependencyProperty.Register(
+            "Orientation", typeof(Orientation), typeof(ButtonGroup), new PropertyMetadata(default(Orientation)));
+
+        public Orientation Orientation
+        {
+            get => (Orientation)GetValue(OrientationProperty);
+            set => SetValue(OrientationProperty, value);
+        }
+
+        public static readonly DependencyProperty ItemStyleSelectorProperty = DependencyProperty.Register(
+            "ItemStyleSelector", typeof(StyleSelector), typeof(ButtonGroup), new PropertyMetadata(new ButtonGroupItemStyleSelector()));
+
+        public StyleSelector ItemStyleSelector
+        {
+            get => (StyleSelector)GetValue(ItemStyleSelectorProperty);
+            set => SetValue(ItemStyleSelectorProperty, value);
+        }
+
+        protected override void OnVisualChildrenChanged(DependencyObject visualAdded, DependencyObject visualRemoved)
+        {
+            base.OnVisualChildrenChanged(visualAdded, visualRemoved);
+
+            var count = Items.Count;
+            for (var i = 0; i < count; i++)
+            {
+                var item = (ButtonBase)Items[i];
+                item.Style = ItemStyleSelector?.SelectStyle(item, this);
+            }
+        }
+    }
+}