title: Modifying uitable column header alignment?
body: <p>I'm updating my generic data manipulation GUI and I thought I would make use of a <code>uitable</code> instead of a <code>uicontrol</code> listbox to display the path(s) and filename(s) of the loaded files. I noticed the column headers are centered by default, and I can't seem to figure out how to left align them if the filename is longer than the width of the table. I checked the properties returned by <code>get</code> and poked around with <a href="http://www.mathworks.com/matlabcentral/fileexchange/14317-findjobj-find-java-handles-of-matlab-graphic-objects" rel="nofollow"><code>findjobj</code></a> but didn't find anything obvious. My attempt to use an html string was also unsuccessful.</p>
  
  <p>Am I missing something obvious?</p>
  
  <p>Sample code:</p>
  
  <pre><code>function testcode
  res = get(0,'ScreenSize');
  figdim = [1280 720]; % Main figure size, pixels
  handles.mainfig = figure( ...
      'Units', 'Pixels', ...
      'Position', [(res(3) - figdim(1))/2 (res(4) - figdim(2))/2 figdim(1) figdim(2)], ...
      'Name', 'Meep', ...
      'Resize', 'off', ...
      'DockControls', 'off', ...
      'NumberTitle', 'off', ...
      'Toolbar', 'figure' ...
      );
  handles.filetable = uitable( ...
      'Parent', handles.mainfig, ...
      'Units', 'normalized', ...
      'Position', [0.038 0.71 0.235 0.1], ...
      'ColumnName', 'File Loaded', ...
      'Data', {'None'} ...
      );
  handles.loadfilebtn = uicontrol( ...
      'Parent', handles.mainfig, ...
      'Style', 'pushbutton', ...
      'Units', 'normalized', ...
      'Position', [0.075 0.85 0.16 0.07], ...
      'String', 'This is a Button, Click', ...
      'Callback', {@abutton} ...
      );
  guidata(handles.mainfig, handles);
  end
  function abutton(hObject,~)
  handles = guidata(hObject);
  
  filepath = 'C:\folder\folder\folder\folder\folder\folder\folder\folder\folder\superduperreallylongfilename.fileextension';
  set(handles.filetable,'Data',{filepath});
  set(handles.filetable,'ColumnWidth',{length(filepath)*5});
  
  test = '&lt;html&gt;&lt;left /&gt;File Loaded&lt;/html&gt;';
  set(handles.filetable,'ColumnName',test); % Attempt #1, doesn't work
  end
  </code></pre>