eclipse plugin - Table Viewer length Increases automatically under Section -

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i newbie swt , layouts. have composite inside have section called "table contens" inside have composite "composite b" inside using table viewer uses tablecolumnlayout.

all composite , sections uses grid layout , griddata griddata = new griddata(griddata.fill, griddata.fill, true, false);

my problem is,first time table contains 5 rows, table size arranges accordingly.if select file populated 10 rows , comes scrollable. when go tab , come table viewer tab refreshes layout , height of viewer adjust 10 rows.

if give height , width manually working griddata objectivesectiondata=new griddata(670,150);

but want table resize based on screen need restrict height of it.

i know need layout .but dont know how it? in need of much.any advice ?

thanks in advance

specify griddata heighthint value, like: 

griddata griddata = new griddata(griddata.fill, griddata.fill, true, false);   griddata.heighthint = 150;

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