ExtJS 4.1 Fieldset Icons

/* iconCls property of the fieldset */
.icon-properties { background-image: url(https://whatisextjs.com/BAHO/icons/table.png) !important;}
 
 /* Icons on fieldsets */
.x-fieldset-header-icon, .ext-ie .x-fieldset-header-icon {
    padding-left: 18px !important;
	background-repeat: no-repeat;
}

// ExtJS 4.1.0 support for fieldset icons
    Ext.form.FieldSet.override({
        createLegendCt: function(){
			var me = this,
				hasIcon = !!me.iconCls,
				items = [],
				legend = {
					xtype: 'container',
					baseCls: this.baseCls + '-header' +
						(hasIcon?' '+me.iconCls+' '+me.baseCls+'-header-icon':''),
					id: me.id + '-legend',
					autoEl: 'legend',
					items: items,
					ownerCt: me,
					ownerLayout: me.componentLayout
				};
 
			// Checkbox
			if (me.checkboxToggle) {
				items.push(me.createCheckboxCmp());
			}
			// Toggle button
			else if (me.collapsible) {
				items.push(me.createToggleCmp());
			}
 
			// Title
			items.push(me.createTitleCmp());
 
			return legend;
        }
    });