DoubleBufferPanel: Fix scrolling inconsistencies

DoubleBufferPanel.cs

@@ -1,4 +1,6 @@
 using System;
+using System.ComponentModel;
+using System.Drawing;
 using System.Runtime.InteropServices;
 using System.Windows.Forms;
 
@@ -17,8 +19,7 @@ namespace CsvView
                           ControlStyles.SupportsTransparentBackColor
                           , true);
         }
-
-
+        
         [DllImport("user32.dll", CharSet = CharSet.Auto)]
         public static extern int SendMessage(IntPtr hWnd, Int32 wMsg, bool wParam, Int32 lParam);
 
@@ -37,5 +38,19 @@ namespace CsvView
             Refresh();
         }
 
+        [DefaultValue(false)]
+        [Localizable(false)]
+        [Category("CatLayout")]
+        [Description("DisableAutoScrollDescr")]
+        public bool DisableAutoScroll { get; set; }
+
+        protected override Point ScrollToControl(Control activeControl)
+        {
+            if (DisableAutoScroll)
+            {
+                return DisplayRectangle.Location;
+            }
+            return base.ScrollToControl(activeControl);
+        }
     }
 }

FrmCsvViewer.Designer.cs

@@ -170,6 +170,7 @@
             | System.Windows.Forms.AnchorStyles.Right)));
             this.pnlData.AutoScroll = true;
             this.pnlData.Location = new System.Drawing.Point(0, 37);
+            this.pnlData.DisableAutoScroll = true;
             this.pnlData.Name = "pnlData";
             this.pnlData.Size = new System.Drawing.Size(508, 432);
             this.pnlData.TabIndex = 11;

FrmCsvViewer.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
-using System.Runtime.InteropServices;
 using System.Windows.Forms;
 
 namespace CsvView
@@ -150,6 +149,7 @@ namespace CsvView
 
             pnlData.SuspendDrawing();
 
+            pnlData.VerticalScroll.Value = 0;
             pnlData.Controls.Clear();
             _currentReg = currentReg;
             txtCurrentReg.Text = Convert.ToString(currentReg);
@@ -208,6 +208,7 @@ namespace CsvView
 
             pnlData.SuspendDrawing();
 
+            pnlData.VerticalScroll.Value = 0;
             pnlData.Controls.Clear();
             pnlReg.Enabled = false;
             txtCurrentReg.Text = string.Empty;