Hello Tony,

I described the problem with the fix ealy in the answer, but forgot to post it in the forum.

The problem is easy. The current code of showHideCol increase or decrease correctly the grid width only in case of shrinkToFit===false. In the code will be corrected adjusted the value of $t.p.tblwidth in the line, but the value will be just ignored in the following line.

To fix the problem I suggest modify the line

cw = this.widthOrg? this.widthOrg: parseInt(this.width,10);
to the following
cw