"Unable to find handle for drawn Canvas" Error in ToolStripMenuButton

[SteveSinger]

Running smartGWT LGPL 2.2 with GWT 2.1.

I have created an extension of the ToolStripMenuButton; the complete widget is below:

import com.smartgwt.client.types.Alignment;
import com.smartgwt.client.widgets.menu.Menu;
import com.smartgwt.client.widgets.toolbar.ToolStripMenuButton;

public class ScAdminToolStripMenuButton extends ToolStripMenuButton {
	
	public ScAdminToolStripMenuButton(String title, Menu menu, String image) {
		
		super(title,menu);
		setAutoFit(false);
		setWidth("135px");
		setMenuButtonImage(image);
		setIconHeight(20);
		setIconWidth(20);
		setIconOrientation("left");
		setAlign(Alignment.CENTER);
		setTitleStyle("sc-toolStripMenuButtonTitle");
		
	}

}

The code to create the widget is as follows:

		Menu  toolsMenu = new Menu();
		toolsMenu.setItems(itemOne, itemTwo);
		ScAdminToolStripMenuButton settingMenuBtn = new ScAdminToolStripMenuButton(language.systemToolsToolBar(),toolsMenu,"menu_systemtools.gif");
		toolStrip.addMenuButton(settingMenuBtn);

(note -- multiple buttons are on the toolstrip, I just showed one example)

When I launch the application in IE, the developer console shows the following:

11:46:03.112:INFO:Log:initialized
11:46:03.159:WARN:Log:New Class ID: 'Window' collides with ID of existing object with value '[object Window]'.  Existing object will be replaced.
This conflict would be avoided by disabling ISC Simple Names mode.  See documentation for further information.
11:46:03.206:WARN:Log:New Class ID: 'Selection' collides with ID of existing object with value '[object Selection]'.  Existing object will be replaced.
This conflict would be avoided by disabling ISC Simple Names mode.  See documentation for further information.
11:46:03.206:WARN:AutoObserver:Use addInterfaceProperties() to add methods to interface [Class AutoObserver]
11:46:03.409:INFO:Log:isc.Page is loaded
11:46:29.583:RSZ2[E]:WARN:ToolStripMenuButton:isc_ScAdminToolStripMenuButton_0:Unable to find handle for drawn Canvas, elementId: isc_L
11:46:29.583:RSZ2[E]:WARN:ToolStripMenuButton:isc_ScAdminToolStripMenuButton_1:Unable to find handle for drawn Canvas, elementId: isc_N
11:46:29.598:RSZ2[E]:WARN:ToolStripMenuButton:isc_ScAdminToolStripMenuButton_3:Unable to find handle for drawn Canvas, elementId: isc_P
11:46:29.598:RSZ2[E]:WARN:ToolStripMenuButton:isc_ScAdminToolStripMenuButton_4:Unable to find handle for drawn Canvas, elementId: isc_R
11:46:29.598:RSZ2[E]:WARN:ToolStripMenuButton:isc_ScAdminToolStripMenuButton_0:Unable to find handle for drawn Canvas, elementId: isc_L
11:46:29.614:RSZ2[E]:WARN:ToolStripMenuButton:isc_ScAdminToolStripMenuButton_0:Unable to find handle for drawn Canvas, elementId: isc_L
11:46:29.614:RSZ2[E]:WARN:ToolStripMenuButton:isc_ScAdminToolStripMenuButton_0:Unable to find handle for drawn Canvas, elementId: isc_L
11:46:29.614:RSZ2[E]:WARN:Label:isc_ScAdminToolStripMenuButton_0_label:Unable to find handle for drawn Canvas, elementId: isc_K
11:46:29.614:RSZ2[E]:WARN:ToolStripMenuButton:isc_ScAdminToolStripMenuButton_1:Unable to find handle for drawn Canvas, elementId: isc_N
11:46:29.630:RSZ2[E]:WARN:ToolStripMenuButton:isc_ScAdminToolStripMenuButton_1:Unable to find handle for drawn Canvas, elementId: isc_N
11:46:29.630:RSZ2[E]:WARN:ToolStripMenuButton:isc_ScAdminToolStripMenuButton_1:Unable to find handle for drawn Canvas, elementId: isc_N
11:46:29.630:RSZ2[E]:WARN:Label:isc_ScAdminToolStripMenuButton_1_label:Unable to find handle for drawn Canvas, elementId: isc_M
11:46:29.645:RSZ2[E]:WARN:ToolStripMenuButton:isc_ScAdminToolStripMenuButton_3:Unable to find handle for drawn Canvas, elementId: isc_P
11:46:29.645:RSZ2[E]:WARN:ToolStripMenuButton:isc_ScAdminToolStripMenuButton_3:Unable to find handle for drawn Canvas, elementId: isc_P
11:46:29.645:RSZ2[E]:WARN:ToolStripMenuButton:isc_ScAdminToolStripMenuButton_3:Unable to find handle for drawn Canvas, elementId: isc_P
11:46:29.661:RSZ2[E]:WARN:Label:isc_ScAdminToolStripMenuButton_3_label:Unable to find handle for drawn Canvas, elementId: isc_O
11:46:29.661:RSZ2[E]:WARN:ToolStripMenuButton:isc_ScAdminToolStripMenuButton_4:Unable to find handle for drawn Canvas, elementId: isc_R
11:46:29.661:RSZ2[E]:WARN:ToolStripMenuButton:isc_ScAdminToolStripMenuButton_4:Unable to find handle for drawn Canvas, elementId: isc_R
11:46:29.676:RSZ2[E]:WARN:ToolStripMenuButton:isc_ScAdminToolStripMenuButton_4:Unable to find handle for drawn Canvas, elementId: isc_R
11:46:29.676:RSZ2[E]:WARN:Label:isc_ScAdminToolStripMenuButton_4_label:Unable to find handle for drawn Canvas, elementId: isc_Q

Any ideas on what might be the cause? As an FYI, I do not get these errors in FireFox, but the screen does not display properly and I get a slew of Javascript errors so for the time being IE is the only option.

Thanks in advance!