liferay portal integration

Hey,

I tried using the grid in a portlet using liferay portal, and when I move the mouse over the PortletHeaderBar, the grid disappears. Has anyone experienced this behavior? is there some event that may cause the grid to disappear?

some research...
the PortletHeaderBar displays its icons in the onMouseOver event.
this calls bar.iconBar.style.display = "block"; (bar is the PortletHeaderBar)

For some reason, this causes the grid to disappear. The bar shares a container with the grid, but they are only siblings.

I found that calling mygrid.refresh() makes the grid reappear, but there doesn't seem to be an event that i can handle to call this when the bar is displayed.

Please help.

Ps, this works in firefox, not in IE.