Palm OS 5 Treo smartphone specific information
The Fourth button normally has a special function on Treo smartphones. After the installation of HBX, however, it's disabled.

To restore the default functionality of the Fourth button, make sure no actions are assigned to it. Then tap the appropriate Three dots icon to open the Button Options window:

Finally check the Auto-repeat checkbox.

Alternatively, after checking the Direct action checkbox, you may assign any action to the Fourth button. Change background color of the pop up window Force the pop up of the HBX pop up window Perform a single action with this hard button Prevent the device from turning on with this hard button Auto-repeat the hard button press on hold Save changes and close this window

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