Question: Is there any way to make text append itself to the bottom of a textarea widget, as well as autoscrolling that text upwards as new text comes in?

String text = getString(textarea, "text") + "\nappended line";
setString(textarea, "text", text);
setInteger(textarea, "start", text.length());
setInteger(textarea, "end", text.length());

setBoolean( find("nameofcheckbox"), "selected", true );
setBoolean( find("nameofcheckbox"), "selected", false );

Container frame = this;
while (!(frame instanceof Frame)) { frame = frame.getParent(); }
       
java.awt.FileDialog filedialog = new java.awt.FileDialog(
                                     (Frame)frame,
                                     "Saveg database...",
                                     FileDialog.SAVE);
filedialog.show();

File fileSelected = new File( filedialog.getDirectory(),
                              filedialog.getFile() );

Assuming your tree is defined: <tree name="ParentTree"></tree>

then you can perform:
Object root = find("ParentTree"); 
Object node = create("node");
setString(node,"text","Node label");
add(root,node);