Hello Jarry ... Thanks for your help
Unfortunately, it's not exactly what I want.
If you ever look at the example set at first (
http://jsfiddle.net/zurfero/jpqxorq1/), when you click on the column panel west (Filter Workers (Click here)) you can see how panel west expand without the central panel (Center) moves.(The letters of the central panel are not displayed).
What method is used when you click on the column of panel west (Filter Workers (Click here))? I would like get the same effect,expand west panel without the central panel moves.
I hope I explained better this time, sorry for my bad english.
Thanks again for your help.