Don't use lazy loading for built-in WPF commands.

src/Main/Core/Project/Src/Util/CommandWrapper.cs

@@ -44,6 +44,17 @@ namespace ICSharpCode.Core
 		/// </summary>
 		public static ICommand CreateLazyCommand(Codon codon, IReadOnlyCollection<ICondition> conditions)
 		{
+			if (codon.Properties["loadclasslazy"] == "false") {
+				// if lazy loading was explicitly disabled, create the actual command now
+				return CreateCommand(codon, conditions);
+			}
+			if (codon.Properties.Contains("command") && !codon.Properties.Contains("loadclasslazy")) {
+				// If we're using the 'command=' syntax, this is most likely a built-in command
+				// where lazy loading isn't useful (and hurts if CanExecute is used).
+				// Don't use lazy loading unless loadclasslazy is set explicitly.
+				return CreateCommand(codon, conditions);
+			}
+			// Create the wrapper that lazily loads the actual command.
 			return new CommandWrapper(codon, conditions);
 		}
 		

src/Main/ICSharpCode.Core.Presentation/Menu/MenuCommand.cs

@@ -32,13 +32,10 @@ namespace ICSharpCode.Core.Presentation
 	{
 		readonly string ActivationMethod;
 		
-		public MenuCommand(UIElement inputBindingOwner, Codon codon, object caller, bool createCommand, string activationMethod, IReadOnlyCollection<ICondition> conditions) : base(codon, caller, conditions)
+		public MenuCommand(UIElement inputBindingOwner, Codon codon, object caller, string activationMethod, IReadOnlyCollection<ICondition> conditions) : base(codon, caller, conditions)
 		{
 			this.ActivationMethod = activationMethod;
-			if (createCommand)
-				this.Command = CommandWrapper.CreateCommand(codon, conditions);
-			else
-				this.Command = CommandWrapper.CreateLazyCommand(codon, conditions);
+			this.Command = CommandWrapper.CreateLazyCommand(codon, conditions);
 			this.CommandParameter = caller;
 			
 			if (!string.IsNullOrEmpty(codon.Properties["shortcut"])) {

src/Main/ICSharpCode.Core.Presentation/Menu/MenuService.cs

@@ -211,7 +211,6 @@ namespace ICSharpCode.Core.Presentation
 		{
 			Codon codon = descriptor.Codon;
 			string type = codon.Properties.Contains("type") ? codon.Properties["type"] : "Command";
-			bool createCommand = codon.Properties["loadclasslazy"] == "false";
 			
 			switch (type) {
 				case "Separator":
@@ -220,7 +219,7 @@ namespace ICSharpCode.Core.Presentation
 					return new MenuCheckBox(context.InputBindingOwner, codon, descriptor.Parameter, descriptor.Conditions);
 				case "Item":
 				case "Command":
-					return new MenuCommand(context.InputBindingOwner, codon, descriptor.Parameter, createCommand, context.ActivationMethod, descriptor.Conditions);
+					return new MenuCommand(context.InputBindingOwner, codon, descriptor.Parameter, context.ActivationMethod, descriptor.Conditions);
 				case "Menu":
 					var item = new CoreMenuItem(codon, descriptor.Parameter, descriptor.Conditions) {
 						ItemsSource = new object[1],

src/Main/ICSharpCode.Core.Presentation/ToolBar/ToolBarButton.cs

@@ -36,16 +36,13 @@ namespace ICSharpCode.Core.Presentation
 		readonly string inputGestureText;
 		readonly IEnumerable<ICondition> conditions;
 		
-		public ToolBarButton(UIElement inputBindingOwner, Codon codon, object caller, bool createCommand, IReadOnlyCollection<ICondition> conditions)
+		public ToolBarButton(UIElement inputBindingOwner, Codon codon, object caller, IReadOnlyCollection<ICondition> conditions)
 		{
 			ToolTipService.SetShowOnDisabled(this, true);
 			
 			this.codon = codon;
 			this.caller = caller;
-			if (createCommand)
-				this.Command = CommandWrapper.CreateCommand(codon, conditions);
-			else
-				this.Command = CommandWrapper.CreateLazyCommand(codon, conditions);
+			this.Command = CommandWrapper.CreateLazyCommand(codon, conditions);
 			this.CommandParameter = caller;
 			this.Content = ToolBarService.CreateToolBarItemContent(codon);
 			this.conditions = conditions;

src/Main/ICSharpCode.Core.Presentation/ToolBar/ToolBarService.cs

@@ -65,15 +65,13 @@ namespace ICSharpCode.Core.Presentation
 			object caller = descriptor.Parameter;
 			string type = codon.Properties.Contains("type") ? codon.Properties["type"] : "Item";
 			
-			bool createCommand = codon.Properties["loadclasslazy"] == "false";
-			
 			switch (type) {
 				case "Separator":
 					return new ConditionalSeparator(codon, caller, true, descriptor.Conditions);
 				case "CheckBox":
 					return new ToolBarCheckBox(codon, caller, descriptor.Conditions);
 				case "Item":
-					return new ToolBarButton(inputBindingOwner, codon, caller, createCommand, descriptor.Conditions);
+					return new ToolBarButton(inputBindingOwner, codon, caller, descriptor.Conditions);
 				case "DropDownButton":
 					return new ToolBarDropDownButton(
 						codon, caller, MenuService.CreateUnexpandedMenuItems(

src/Main/ICSharpCode.Core.WinForms/Menu/MenuCommand.cs

@@ -43,23 +43,13 @@ namespace ICSharpCode.Core.WinForms
 		}
 		
 		public MenuCommand(Codon codon, object caller, IReadOnlyCollection<ICondition> conditions)
-			: this(codon, caller, false, conditions)
-		{
-			
-		}
-		
-		public MenuCommand(Codon codon, object caller, bool createCommand, IReadOnlyCollection<ICondition> conditions)
 		{
 			this.RightToLeft = RightToLeft.Inherit;
 			this.caller        = caller;
 			this.codon         = codon;
 			this.conditions  = conditions;
 			
-			if (createCommand) {
-				this.command = CommandWrapper.CreateCommand(codon, conditions);
-			} else {
-				this.command = CommandWrapper.CreateLazyCommand(codon, conditions);
-			}
+			this.command = CommandWrapper.CreateLazyCommand(codon, conditions);
 			
 			UpdateText();
 		}

src/Main/ICSharpCode.Core.WinForms/Menu/MenuService.cs

@@ -62,7 +62,7 @@ namespace ICSharpCode.Core.WinForms
 					return new MenuCheckBox(codon, descriptor.Parameter, descriptor.Conditions);
 				case "Item":
 				case "Command":
-					return new MenuCommand(codon, descriptor.Parameter, createCommand, descriptor.Conditions);
+					return new MenuCommand(codon, descriptor.Parameter, descriptor.Conditions);
 				case "Menu":
 					return new Menu(codon, descriptor.Parameter, ConvertSubItems(descriptor.SubItems), descriptor.Conditions);
 				case "Builder":