other event types not only on buttons - how to handle

[LoWang 1]

For example I have a text input created by guictrlcreateinput and I want it to erase its text when clicked. How can I set such an event handle? GUICtrlSetOnEvent seem to do nothing on this control since its not a button.

Is there any possibility to check special events on controls like keypress or mousedown? I thought that maybe GUICtrlSetOnEvent function will return the id of control which was clicked for example and then I would be able o check that my input was clicked, but it doesn't work, because the @GUI_CTRLID is alway -7 wherever I click!