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When using the default css and have two grids one above another the filter options panel displays underneath the headerbar of the second grid if they are close enough. In order to remedy this you can adjust the z-index as such:
.t-grid .t-animation-container
{
position: absolute;
height: 210px;
width: 156px;
z-index: 1000; <----- Add this, or whatever value works for you.
}