@Override
    public boolean setFocus()
    {
        redrawCaret(false);
        if (lastFocusedTextArea == 1)
            return hexText.setFocus();
        else
            return previewText.setFocus();
    }
Causes the receiver to have the keyboard focus. Within Eclipse, never call setFocus() before
the workbench has called EditorActionBarContributor.setActiveEditor()

@see Composite#setFocus()
plugins/org.jkiss.dbeaver.ui.editors.hex/src/org/jkiss/dbeaver/ui/editors/binary/HexEditControl.java