ContextMenu won't work with the word "copy"

programming flash
1

I don’t get it.
This following codes won’t work,

this.createTextField("news_txt", this.getNextHighestDepth(), 10, 10, 320, 240);
news_txt.border = true;
news_txt.wordWrap = true;
news_txt.multiline = true;
news_txt.text = "To see the custom context menu item, right click (PC) or ";
news_txt.text += "control click (Mac) within the text field.";
var menu_cm:ContextMenu = new ContextMenu();
menu_cm.customItems.push(new ContextMenuItem("Copy Link", doResize));

function doResize(obj:TextField, item:ContextMenuItem):Void {
    // "Resize" code here
    trace("you selected: "+item.caption);
}
news_txt.menu = menu_cm;

where as this would work:

this.createTextField("news_txt", this.getNextHighestDepth(), 10, 10, 320, 240);
news_txt.border = true;
news_txt.wordWrap = true;
news_txt.multiline = true;
news_txt.text = "To see the custom context menu item, right click (PC) or ";
news_txt.text += "control click (Mac) within the text field.";
var menu_cm:ContextMenu = new ContextMenu();
menu_cm.customItems.push(new ContextMenuItem("_Copy Link", doResize));

function doResize(obj:TextField, item:ContextMenuItem):Void {
    // "Resize" code here
    trace("you selected: "+item.caption);
}
news_txt.menu = menu_cm;

where the only difference is:
menu_cm.customItems.push(new ContextMenuItem(“Copy Link”, doResize));
and this:
menu_cm.customItems.push(new ContextMenuItem("[COLOR=Red]_[/COLOR]Copy Link", doResize));

I was just trying to get a “Copy link” when the user clicks on a link.

Thanks in advance.