title: how to call doSave(IProgressMonitor) function of FormEditor in SWT
body: <p>In an Eclipse plugin project, I have an editor which extends <code>FormEditor</code>. The user can save the editor when press Ctrl+S. I have created a save button in the editor, so I want to save the editor when I press the save button. I call the <code>doSave(IProgressMonitor)</code> function of editor, but I can't find the default object of <code>IProgressMonitor</code>. I can't provider the parameter:  IProgressMonitor.</p>