This doesn't seem to make sense, and unfortunately the one example on trirand seems to have the same bug
with this column model
{name:'txtFixtureType', index:'txtFixtureType', width:110,
stype: 'select',
edittype:'select', editoptions: {
value: ":All;1:Division 1;2:Division 2"}},
Enabling a toolbar search results in a select for the column, with the values populated. However with the advanced search dialog the select appears, but contains no values.
Is there some addition property that needs to be set?