A very simple plugin inspired by http://extjs.com/forum/showthread.php?t=33162
It appends a help message above or below a Field.
eg:

Code:
Ext.ux.FieldHelp = Ext.extend(Object, (function(){
function syncInputSize(w, h) {
this.el.setSize(w, h);
}
function afterFieldRender() {
if (!this.wrap) {
this.wrap = this.el.wrap({cls: 'x-form-field-wrap'});
this.positionEl = this.resizeEl = this.wrap;
this.actionMode = 'wrap';
this.onResize = this.onResize.createSequence(syncInputSize);
}
this.wrap[this.helpAlign == 'top' ? 'insertFirst' : 'createChild']({
cls: 'x-form-helptext',
html: this.helpText
});
}
return {
constructor: function(t, align) {
this.helpText = t;
this.align = align;
},
init: function(f) {
f.helpAlign = this.align;
f.helpText = this.helpText;
f.afterRender = f.afterRender.createSequence(afterFieldRender);
}
};
})());
CSS:
Code:
.x-form-helptext {
font-size: 9px;
color: #888;
}