here it is ('this' in the next code is a widget that extends a HBox widget):
this._help = new
qx.ui.basic.Image("qx/icon/Oxygen/16/actions/help-contents.png");
this.add(this._help);
var myTT = new qx.ui.tooltip.ToolTip('the <b>initial html</b> code');
myTT.setRich( true );
myTT.setShowTimeout( 200 );
this._help.setToolTip(myTT);
var newhelp=true;
this._help.addListener("mouseover", function (e) {
if(newhelp)
{
newhelp=false;
var req = new qx.io.remote.Request("/help.txt");
req.addListener("completed", function (e) {
var content=e.getContent();
myTT.setLabel(content);
});
req.send();
}
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