In the shell view , a data grid is located on the bottom of the screen , each time  a grid's row  is clicked a tab is opened on the top of the shell view.

both of the data grid view and the tabs are set in a split container.

 this is the script that causes prb :

- I open 2 tabs by clicking 2 rows from thegrid.

- The focus is on the second tab.

- I re size(vertically)  the panel containing the grid.

- the focus on the second tab is lost and moves to the first tab.

how and why this happens ?

thanks