| xpMode_Direct | 0 |
The message will only be sent to the target widget. |
| xpMode_UpChain | 1 |
The message is sent to the target widget, then up the chain of parents until the message is handled or a parentless widget is reached. |
| xpMode_Recursive | 2 |
The message is sent to the target widget and then all of its children recursively depth-first. |
| xpMode_DirectAllCallbacks | 3 |
The message is snet just to the target, but goes to every callback, even if it is handled. |
| xpMode_Once | 4 |
The message is only sent to the very first handler even if it is not accepted. (This is really only useful for some internal Widget Lib functions. |