Make our custom buttons usable with Tab

AM2RLauncher/AM2RLauncher/MainForm/CustomControls/CustomButton.cs

@@ -32,14 +32,13 @@ public class CustomButton : Drawable
         get { return base.Enabled; }
         set
         {
-            if (base.Enabled != value)
-            {
+            if (base.Enabled == value)
+                return;
             base.Enabled = value;
             if (Loaded)
                 Invalidate();
         }
     }
-    }
 
     /// <summary>Gets or sets <see cref="pressed"/>.</summary>
     public bool Pressed
@@ -88,7 +87,11 @@ public class CustomButton : Drawable
     }
 
     /// <summary>Default constructor. Sets <see cref="Enabled"/> to true.</summary>
-    public CustomButton() { Enabled = true; }
+    public CustomButton()
+    {
+        Enabled = true;
+        CanFocus = true;
+    }
 
     /// <summary>Event raised when this control is resized.</summary>
     /// <param name="e"></param>
@@ -106,12 +109,11 @@ public class CustomButton : Drawable
     protected override void OnMouseDown(MouseEventArgs e)
     {
         base.OnMouseDown(e);
-        if (Enabled)
-        {
+        if (!Enabled)
+            return;
         mouseDown = true;
         Invalidate();
     }
-    }
 
     /// <summary>
     /// Event raised when the mouse enters this control's bounding box.
@@ -137,6 +139,20 @@ public class CustomButton : Drawable
         Invalidate();
     }
 
+    protected override void OnGotFocus(EventArgs e)
+    {
+        hover = true;
+        base.OnGotFocus(e);
+        Invalidate();
+    }
+
+    protected override void OnLostFocus(EventArgs e)
+    {
+        hover = false;
+        base.OnLostFocus(e);
+        Invalidate();
+    }
+
     /// <summary>
     /// Event raised when the mouse is released over this control's bounding box.
     /// </summary>

AM2RLauncher/AM2RLauncher/MainForm/CustomControls/ImageButton.cs

@@ -99,5 +99,8 @@ public class ImageButton : CustomButton
         var xoffset = (this.Size.Width - size.Width) / 2;
         var yoffset = (this.Size.Height - size.Height) / 2;
         pe.Graphics.DrawImage(image, xoffset, yoffset, size.Width, size.Height);
+        if (Hover)
+            // This can probably be done prettier, but can't be bothered to much with it to be honest.
+            pe.Graphics.DrawRectangle(SystemColors.Highlight, xoffset, yoffset, size.Width, size.Height);
     }
 }