Html Editor Text Area Issue

[team.avesta]

Hii....
I am Using ExtJs 4.1.2a commercial version.
.
I am using html editor in my form Panel...my problem is that i have different resolutions on different machines...
.
i have given html editor a flexible width and the HTML editor expands and collapses perfectly....but the problem is with the TEXT AREA of the editor....it remains constant...
.
here is my code :

Ext.define('JS.view.User.ProjectCharterCenterAuthorization',           {
    extend: 'Ext.form.Panel',
    alias : 'widget.projectchartercenterauthorization',
    autoScroll : true,
    shrinkWrap: true,
    store : 'ProjectCharterCenterAuthorizationStore',
     items: [{
                xtype: 'fieldset',
                margin : '0 5 5 5',
                title: 'Sponsor Details',
                items:[{
                        xtype: 'combo',
                                //width: 375,
                        fieldLabel: 'Sponsor',
                        dataIndex: 'sponsor',
                        name: 'sponsor',
                        margin : '0 0 10 0',
                        height : '10%'
                     },{
    
                        xtype: 'htmleditor',
                        scrollable : true,
                        flex : 1,
                        width : '100%',
                        layout: {
                                    type: 'vbox',
                                    align: 'stretch',
                                    autoSize: true
                              },
                        //height : 100,
                        //width: 375,
                        //layout : 'fit',
                        //flex : 1,
                        //resizable : true,
                        //resizeHandles : 'all',
                        fieldLabel: 'Authority',
                        name: 'sponsorAuthority',
                        dataIndex: 'sponsorAuthority'
                        
                }]
            }]
});

and here is my Screen Shott :
html-editor.png

[mitchellsimoens]

I'm going to open a bug for this.

[team.avesta]

I got some solution to this...
.
i used layout : 'anchor' and taken it 100%....and my problem is solved as of now...
.
i dont know that this is a final solution .
.
.
Thanks