title: Extjs Grid Panel Filter - Clear filters only in one column
body: <p>This question (<a href="https://stackoverflow.com/questions/5011042/extjs-gridfilter-how-to-clearfilter-without-reloading-store">EXTjs gridfilter: How to clearfilter without reloading store?</a>) shows how to clear all the filters on the entire grid.</p>
  
  <p>Is there a way to clear only the filters in a specific column? For example, if I have a column with a list filter that has 20 options and I select 8 of them, I'd like a button that will uncheck all of those, but leave any other filters I've selected to remain in tact.</p>
  
  <p>The 'size' column on this demo is a good example of what the filtering looks like: <a href="http://dev.sencha.com/deploy/ext-4.0.0/examples/grid-filtering/grid-filter-local.html" rel="nofollow noreferrer">http://dev.sencha.com/deploy/ext-4.0.0/examples/grid-filtering/grid-filter-local.html</a></p>