Mine

Index: System.Windows.Forms/Control.cs
===================================================================
--- System.Windows.Forms/Control.cs	(revision 74849)
+++ System.Windows.Forms/Control.cs	(working copy)
@@ -4282,11 +4282,16 @@
 				}
 
 				if (IsHandleCreated) {
-					XplatUI.SetVisible(Handle, is_visible, true);
-					// Explicitly move Toplevel windows to where we want them;
-					// apparently moving unmapped toplevel windows doesn't work
-					if (is_visible && (this is Form)) {
-						XplatUI.SetWindowPos(window.Handle, bounds.X, bounds.Y, bounds.Width, bounds.Height);
+					XplatUI.SetVisible (Handle, is_visible, true);
+					
+					if (is_visible && this is Form) {
+						// If we are Min or Max, we won't get a WM_SHOWWINDOW from SetWindowState,
+						// so we need to manually create our children, and set them visible
+						// (This normally happens in WmShowWindow.)
+						if ((this as Form).WindowState != FormWindowState.Normal)
+							OnVisibleChanged (EventArgs.Empty);
+						else
+							XplatUI.SetWindowPos(window.Handle, bounds.X, bounds.Y, bounds.Width, bounds.Height);	
 					}
 				}
 				else {
@@ -4901,13 +4906,14 @@
 
 		private void WmShowWindow (ref Message m) {
 			if (m.WParam.ToInt32() != 0) {
-				CreateControl ();
-				/* if we're being shown, make sure our child controls all have their handles created */
-				Control [] controls = child_controls.GetAllControls ();
-				for (int i=0; i<controls.Length; i++) {
-					if (controls [i].is_visible) {
-						controls [i].CreateControl ();
-						XplatUI.SetParent(controls[i].Handle, window.Handle); 
+				if (m.LParam.ToInt32 () == 0) {
+					CreateControl ();
+				
+					// Make sure all our children are properly parented to us
+					Control [] controls = child_controls.GetAllControls ();
+					for (int i=0; i<controls.Length; i++) {
+						if (controls [i].is_visible && controls[i].IsHandleCreated)						
+							XplatUI.SetParent(controls[i].Handle, window.Handle); 
 					}
 				}
 			}
@@ -4923,7 +4929,13 @@
 				}
 			}
 
-			if (is_toplevel || (this is Form && ((Form) this).IsMdiChild)) /* XXX make sure this works for mdi forms */
+			// If the form is Max/Min, it got its OnVisibleChanged in SetVisibleCore
+			if (this is Form) {
+				Form f = (Form)this;
+				
+				if (f.IsMdiChild || f.WindowState == FormWindowState.Normal) /* XXX make sure this works for mdi forms */
+					OnVisibleChanged(EventArgs.Empty);
+			} else if (is_toplevel)
 				OnVisibleChanged(EventArgs.Empty);
 		}
 
@@ -5619,6 +5631,9 @@
 
 		[EditorBrowsable(EditorBrowsableState.Advanced)]
 		protected virtual void OnVisibleChanged(EventArgs e) {
+			if (!this.Created)
+				this.CreateControl ();
+				
 			EventHandler eh = (EventHandler)(Events [VisibleChangedEvent]);
 			if (eh != null)
 				eh (this, e);
Index: System.Windows.Forms/Form.cs
===================================================================
--- System.Windows.Forms/Form.cs	(revision 74849)
+++ System.Windows.Forms/Form.cs	(working copy)
@@ -87,11 +87,11 @@
 		private bool			is_loaded;
 		internal bool			is_changing_visible_state;
 		internal bool			has_been_visible;
+		private bool			shown_raised;  // The shown event is only raised once
 
 #if NET_2_0
 		private MenuStrip		main_menu_strip;
 		private bool			show_icon = true;
-		private bool			shown_raised;  // The shown event is only raised once
 #endif
 		#endregion	// Local Variables
 
@@ -1076,7 +1076,8 @@
 		[MWFCategory("Layout")]
 		public FormWindowState WindowState {
 			get {
-				if (IsHandleCreated) {
+				// Don't actually rely on the WM until we've been shown
+				if (IsHandleCreated && shown_raised) {
 
 					if (window_manager != null)
 						return window_manager.GetWindowState ();
@@ -1092,7 +1093,7 @@
 			set {
 				FormWindowState old_state = window_state;
 				window_state = value;
-				if (IsHandleCreated) {
+				if (IsHandleCreated && shown_raised) {
 
 					if (window_manager != null) {
 						window_manager.SetWindowState (old_state, value);
@@ -1261,9 +1262,6 @@
 				if (HelpButton && !MaximizeBox && !MinimizeBox) {
 					cp.ExStyle |= (int)WindowExStyles.WS_EX_CONTEXTHELP;
 				}
-				
-				if (VisibleInternal)
-					cp.Style |= (int)WindowStyles.WS_VISIBLE;
 
 				if (opacity < 1.0 || TransparencyKey != Color.Empty) {
 					cp.ExStyle |= (int)WindowExStyles.WS_EX_LAYERED;
@@ -2059,6 +2057,10 @@
 				is_changing_visible_state = true;
 				has_been_visible = value || has_been_visible;
 				base.SetVisibleCore (value);
+				
+				if (value && this.WindowState != FormWindowState.Normal)
+					XplatUI.SendMessage (this.Handle, Msg.WM_SHOWWINDOW, (IntPtr)1, IntPtr.Zero);
+					
 				is_changing_visible_state = false;
 			}
 			
@@ -2078,13 +2080,14 @@
 				PerformLayout ();
 				ThemeEngine.Current.ManagedWindowSetButtonLocations (window_manager);
 			}
-#if NET_2_0
+			
 			// Shown event is only called once, the first time the form is made visible
 			if (value && !shown_raised) {
+#if NET_2_0
 				this.OnShown (EventArgs.Empty);
+#endif
 				shown_raised = true;
 			}
-#endif
 		}
 
 		protected override void UpdateDefaultButton() {