Cannot resize tab width nor make the tabs resizable

Hello, I am using GXT3.1.2/GWT2.6.

First of all, I want to set the tab width to specific width. I tried to use setTabWidth, but no luck. This is my code.

private void initializeTabPanel(){

tabPanel = new TabPanel();

tabPanel.setAnimScroll(true);

tabPanel.setTabScroll(true);

tabPanel.setCloseContextMenu(true);

tabPanel.setTabWidth(600);

}

Second, I want to let the tabs fill up remaining spaces of the tabPanel, but still no luck.

This is my code:

private void initializeTabPanel(){

tabPanel = new TabPanel();

tabPanel.setAnimScroll(true);

tabPanel.setTabScroll(true);

tabPanel.setCloseContextMenu(true);

tabPanel.setResizeTabs(true);

}

I attached a picture to show what I want to achieve. I am not sure whether I made some mistake or it is just a bug. Please help.

Untitled picture.jpg

Cannot resize tab width nor make the tabs resizable