Ext Treepanel: Resize itself according to the window size change

Recently do a project, using the Ext treepanel to generate a tree view, when the window is very small, treepanel can only be displayed in a tiny area, when the tree view appears scrollbars, but when the window full screen, at this time Treepanel or in the previous small area display, the following figure:

Look at the source code, this situation is because ext in the generation of treepanel specified its height for a fixed value such as 100px.

How to solve this problem. You need to introduce EXT's WindowResize event Ext.EventManager.onWindowResize (function (w,h) ... {
Mytreepanel.syncsize ();

}, this, true);

Just call the Syncsize () method and redraw the size of the panel area.

Look at the Ext event mechanism, found that is really good, can be very convenient to join the event you want