It might be possible to add your own controls to the IDE toolbar, but I am not aware of any simple way to achieve that.

You could define and use your own usercontrols.

What are you trying to do?

Greetings

A1880

There is a separate thread on serial communication.

Greetings

A1880

In Jabaco you have to use the project classpath to define the referenceable Java libraries. Press key F1 in the IDE to view or edit the list of Jar files.

To actually use a specific class, you can either use the "import" statement in you source or explicitely write out the path.
Example: you could write "import java#io" to use "File", or you could write "java#io#File"

The Jabaco IDE provides a set of predefined controls in the toolbar. Additionally to that, you can add your own class definitions or usercontrol definitions to your project using the project explorer at the right-hand side of the screen. You could, for instance, copy and modify control source code out of the Jabaco framework and add the modified control to your project. It is also feasible to use an existing control class and derive your own sub-class which overrides certain methods or adds new methods.

Please search the forum for related posts to get a clearer picture of Jabaco's features.
Compared to VB6, the Jabaco IDE is rather flexible in many respects. Worth to be explored!

Greetings

A1880