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Sample using latest build of DHTMLX released

this.win = dhxWins.createWindow("ec", 10, 10, 600, 600);
this.win.setText("View/Edit Comments");
this.winLayout = this.win.attachLayout("2E");
this.winLayout.cells("a").hideHeader();
this.winLayout.cells("b").setHeight(250);
this.winLayout.cells("b").fixSize(false, true);
this.winLayout.cells("b").hideHeader();
this.winLayBar = this.winLayout.cells("b").attachToolbar();
this.winLayBar.setIconsPath("images/toolbar/");
this.winLayBar.addButton("save", 1, "Save", "save.gif");
this.winLayBar.attachEvent("onClick", this.toolbarButtonHandler);
this.winLayEdit = this.winLayout.cells("b").attachEditor();
this.winLayEdit.setIconsPath("includes/dhtmlX_imgs/");
this.winLayEdit.init();
this.win.centerOnScreen();
this.win.setModal(true);

The issue was not reproduced with the latest files. Please, take a look at the attached sample