Changes to make the context menu work on multiple items

git-svn-id: http://svn.code.sf.net/p/greenshot/code/trunk@1629 7dccd23d-a4a3-4e1f-8c07-b4c1b4018ab4

Greenshot/Drawing/BitmapContainer.cs

@@ -116,17 +116,17 @@ namespace Greenshot.Drawing {
 				graphics.DrawImage(bitmap, Bounds); 
 			}
 		}
-		
-		public override void AddContextMenuItems(ContextMenuStrip menu) {
-			base.AddContextMenuItems(menu);
-			ToolStripMenuItem resetItem = new ToolStripMenuItem("Reset size");
-			resetItem.Click += delegate {
-				this.Invalidate();
-				Width = Bitmap.Width;
-				Height = Bitmap.Height;
-				this.Invalidate();
-			};
-			menu.Items.Add(resetItem);
+
+		public override bool hasDefaultSize {
+			get {
+				return true;
+			}
+		}
+
+		public override Size DefaultSize {
+			get {
+				return bitmap.Size;
+			}
 		}
 	}
 }