Changing JTableHeader Height

I am changing TableHeader height using
Dimension preferredSize = new Dimension();
int height = DColHeaderSld.getValue(); //Getting slider value
int width = DColTbl.getTableHeader().getWidth(); //Keeping the same width
preferredSize.setSize(width,height);
DColTbl.getTableHeader().setPreferredSize(preferredSize);
It works fine but I can not see the updated column height unless I resize or add/remove any column.
Anyone has any idea?
Thanks
-Sat'n

You need to re-validate your header.
Add:
DColTbl.getTableHeader().validate();
DColTbl.getTableHeader().repaint();
and it should update right away

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