Use value get - (ui.g("uiElementId") - and set / update - ui.u("uiElementId",value) -
to use (not active) ui elements as display.
var onInitFunction = onInit;
function onInit() {
onInitFunction();
dsp._eRegisterCanvas("dspCanvas", dw, dh);
touch._eRegisterCanvas("dspCanvas", 10, 10);
}