Adjust project structure

src/Shared/HandyControl_Shared/Controls/Input/WatermarkTextBox.cs

@@ -0,0 +1,36 @@
+using System.Windows;
+
+namespace HandyControl.Controls
+{
+    internal class WatermarkTextBox : TextBox
+    {
+        #region Public Properties
+
+        #region Watermark
+
+        public static readonly DependencyProperty WatermarkProperty = DependencyProperty.Register(
+            "Watermark", typeof(object), typeof(WatermarkTextBox), new PropertyMetadata(default(object)));
+
+        public object Watermark
+        {
+            get => GetValue(WatermarkProperty);
+            set => SetValue(WatermarkProperty, value);
+        }
+
+        #endregion Watermark
+
+        #endregion Public Properties
+
+        protected override void OnGotFocus(RoutedEventArgs e)
+        {
+            base.OnGotFocus(e);
+            if (IsEnabled)
+            {
+                if (!string.IsNullOrEmpty(Text))
+                {
+                    Select(0, Text.Length);
+                }
+            }
+        }
+    }
+}