xtypeとclass

一般
xtype        | class
-------------+---------------------------
box          | Ext.BoxComponent
button       | Ext.Button
colorpalette | Ext.ColorPalette
component    | Ext.Component
container    | Ext.Container
cycle        | Ext.CycleButton
dataview     | Ext.DataView
datepicker   | Ext.DatePicker
editor       | Ext.Editor
editorgrid   | Ext.grid.EditorGridPanel
grid         | Ext.grid.GridPanel
paging       | Ext.PagingToolbar
panel        | Ext.Panel
progress     | Ext.ProgressBar
splitbutton  | Ext.SplitButton
tabpanel     | Ext.TabPanel
treepanel    | Ext.tree.TreePanel
viewport     | Ext.ViewPort
window       | Ext.Window

ツールバーコンポーネント
xtype        | class
-------------+---------------------------
toolbar      | Ext.Toolbar
tbitem       | Ext.Toolbar.Item
tbseparator  | Ext.Toolbar.Separator
tbspacer     | Ext.Toolbar.Spacer
tbfill       | Ext.Toolbar.Fill
tbtext       | Ext.Toolbar.TextItem
tbbutton     | Ext.Toolbar.Button
tbsplit      | Ext.Toolbar.SplitButton

フォームコンポーネント
xtype        | class
-------------+---------------------------
checkbox     | Ext.form.Checkbox
combo        | Ext.form.ComboBox
datefield    | Ext.form.DateField
field        | Ext.form.Field
fieldset     | Ext.form.FieldSet
form         | Ext.FormPanel
hidden       | Ext.form.Hidden
htmleditor   | Ext.form.HtmlEditor
numberfield  | Ext.form.NumberField
radio        | Ext.form.Radio
textarea     | Ext.form.TextArea
textfield    | Ext.form.TextField
timefield    | Ext.form.TimeField
trigger      | Ext.form.TriggerField