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Cursor is visible in the left-top corner of the panel in dhtmlxLayout when the attached tree is enabled to Navigate with Keyboard

Dear,

I use dhtmlxLayout of 2E pattern in IE7.

When a dhtmlxTree is attached to a panel of dhtmlxLayout and is enabled to navigate with Keyboard, then I focus the panel by clicking anywhere in the panel, I see a cursor twinkle in the left-top corner.

the example code is as follow:
<script type="text/javascript">
var navigateLayout = new dhtmlXLayoutObject("xx", "2E", "dhx_blue");
dhxTree=navigateLayout.cells("a").attachTree(0);
dhxTree.enableKeyboardNavigation(true);
</script>

Would you like to give me some advice to eliminate the cursor?

Thanks very much.