I have a borderlayout with a grid panel (Beta 4) with a double click listener on the grid. The double-click listener spawns a new tab like your feed viewer example (which works great by the way). I just noticed that when I have a row selected in the grid, and I double-click a column separator to auto-size a column, that it spawns a new tab via the listener. This occurs even if I de-select the row. So I'm wondering if the listener I attached to the grid should only apply to the grid area and not the columns. Bug?