extjs Adding html to panel

After struggling to check why is my panel no reflecting,

i realised ive forgotten to call doLayout in the end.

To add a html to a extpanel,

Ext.getCmp("panelid").add( {

type: "panel",

html: "some html here"

});

Ext.getCmp("panelid").doLayout();

To remove all html content in a panel:

Ext.getCmp("panelid").removeAll();

//only works in 2.2.1 all later