import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.TreeEditor;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeColumn;
import org.eclipse.swt.widgets.TreeItem;

public class TestTreeScrollbars {

    public static void main(String[] args) {
        Display display = new Display();

        Shell shell = new Shell(display, SWT.SHELL_TRIM);
        shell.setLayout(new FillLayout());

        Tree tree = new Tree(shell, SWT.NONE);
        tree.setHeaderVisible(true);
        tree.setLinesVisible(true);
        for (int i = 0; i < 3; ++i) {
            TreeColumn col = new TreeColumn(tree, SWT.NONE);
            col.setText("Column " + i);
        }

        shell.pack();
        shell.setSize(200, 200);
        shell.open();

        // Create tree items with tree editors for the second column
        for (int i = 0; i < 10; ++i) {
            TreeItem item = new TreeItem(tree, SWT.NONE);
            item.setText(0, "Some test text");
            Combo control = new Combo(tree, SWT.READ_ONLY);
            control.setItems("test1", "test2");
            TreeEditor treeEditor = new TreeEditor(tree);
            treeEditor.grabHorizontal = treeEditor.grabVertical = true;
            treeEditor.setEditor(control, item, 1);
            item.setText(2, "End text");
        }

        // Pack all columns
        for (TreeColumn column : tree.getColumns()) {
            /*
             * Double packing just because the middle TreeEditor column displays
             * really small for me otherwise
             */
            column.pack();
            column.pack();
        }

        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
    }
}